Overstimulation and Sensory Overload: When the World Is Too Much

The supermarket is not especially dramatic.

Fluorescent lights.

Background music.

A trolley with one uncooperative wheel.

Cold air from the refrigerators.

Children talking.

A machine beeping.

Someone standing too close.

Twenty versions of the same product.

A phone notification.

A decision about dinner.

None of these things is enormous on its own.

But halfway through the shop, something changes.

The lights feel sharper.

Every sound separates itself from the background.

The label you need becomes impossible to find.

Another question feels unreasonable.

Your shoulders rise.

Your thinking narrows.

You want to leave immediately, or stand completely still and stop choosing anything.

The problem may not be one sound, one light or one person.

It may be the total.

This is where the idea of sensory overload becomes useful.

Not as a diagnosis.

Not as proof that the nervous system is damaged.

As a description of a moment when incoming demands exceed the capacity available to process, filter, organize or respond to them comfortably.

The world has not necessarily become louder.

Your remaining room for it has become smaller.

The Input Budget

Imagine that you begin the day with an input budget.

The budget is not a fixed number.

It changes.

A bright room may feel fine after restful sleep.

The same room may feel unbearable during a migraine.

A busy cafe may feel energizing when you are relaxed.

The same cafe may become impossible after six hours of meetings.

A child's repeated question may be easy to answer on Saturday morning and feel like one question too many on Wednesday evening.

The input has not changed much.

Capacity has.

Your available budget may be influenced by:

sleep
hunger
pain
illness
migraine
stress
grief
hormonal changes
workload
medication
social pressure
previous sensory exposure
uncertainty
how much control you have
whether escape is possible
how many decisions remain
whether you are also masking discomfort

A recent daily-life study found that self-reported overstimulation varied across the day and was associated with factors including fatigue, negative mood, social presence and unpleasant visual or auditory input. That does not establish one universal mechanism, but it supports an important practical point: sensitivity and capacity can fluctuate.

You are not necessarily imagining the difference.

The same environment can cost more on a low-capacity day.

Sensory Load Is More Than Loud Noise

People often hear "sensory" and think only about sound.

Sensory load can arrive through many channels.

Sound

Examples:

overlapping conversations
alarms
traffic
chewing
machinery
music
repetitive tapping
sudden noises
high-pitched electronics
unpredictable volume changes

Sound is especially difficult when several sources compete for attention.

One continuous sound may be manageable.

Five unrelated sounds may not be.

Light and Vision

Examples:

fluorescent lighting
glare
flicker
bright screens
rapid video cuts
moving crowds
clutter
strong visual patterns
sunlight reflecting from surfaces
many objects competing for attention

Visual overload is not limited to brightness.

Movement, complexity and contrast can also matter.

Touch

Examples:

clothing seams
tight waistbands
unexpected touch
crowds brushing past
sticky hands
certain fabrics
hair touching the face
tags
heat or cold against the skin

A touch that is comfortable when chosen may feel very different when unexpected.

Smell and Taste

Examples:

perfume
cleaning chemicals
cooking smells
smoke
scented products
mixed food smells
strong flavours
lingering odours in enclosed spaces

Smell is difficult to "look away" from.

Once it fills the room, the room becomes the smell.

Movement and Balance

Examples:

riding in a car
escalators
busy visual motion
spinning
unstable surfaces
crowded transport
rapidly changing visual scenes
virtual-reality experiences

Some people become dizzy, nauseated or disoriented when visual and movement signals do not fit together comfortably.

Temperature and Internal Sensation

Examples:

heat
cold
hunger
thirst
pain
bladder pressure
nausea
heartbeat awareness
breathlessness
fatigue

Internal sensations use processing capacity too.

A room may feel more overwhelming when the body is already managing pain or illness.

Social and Cognitive Input

Not all overload arrives through a traditional sense.

Consider:

being watched
interpreting tone
maintaining eye contact
following a group conversation
deciding when to speak
remembering instructions
responding politely
hiding discomfort
making repeated choices
changing plans unexpectedly

A social environment can combine sound, vision, language, expectation and performance into one dense stream of input.

Sometimes the hardest part is not the number of people, but the number of signals you are trying to read at once.

Overload Is Usually Cumulative

One common mistake is searching for the single trigger.

Sometimes there is one.

A fire alarm.

A flashing light.

A strong perfume.

But overload often accumulates.

Consider this sequence:

You sleep poorly.

Skip breakfast.

Drive through heavy traffic.

Work under bright lights.

Attend two video meetings.

Answer messages while eating.

Receive an unexpected request.

Enter a crowded shop.

Then someone asks a simple question.

You react sharply.

From the outside, it appears that the question caused the reaction.

But the question may have been only the final coin placed on an already full stack.

The better investigation is not:

Why did that tiny thing upset me?

It is:

What had already filled the system before that moment arrived?

The Sensory Load Equation

There is no clinical equation that calculates sensory overload.

But this practical model can help:

Load increases with intensity, duration, complexity and unpredictability. Capacity decreases with fatigue, pain, stress and lack of control.

Consider six variables.

Intensity

How bright, loud, strong or physically demanding is the input?

Duration

How long has it continued?

A tolerable sound for thirty seconds may become unbearable after an hour.

Complexity

How many different signals require processing?

One voice is not the same as six voices plus music and notifications.

Predictability

Do you know what will happen next?

A predictable mechanical hum may be easier than sudden, irregular banging.

Control

Can you lower the volume, leave, pause or choose where to sit?

Control changes the experience of the same input.

Capacity

How much processing room is available today?

This is why two people, or the same person on two different days, can have very different responses to the same environment.

Filtering Is Active Work

In a cafe, many sounds reach the ears.

The nervous system does not simply record everything at equal importance.

Attention helps select what matters.

The voice across the table becomes foreground.

The coffee machine becomes background.

Until it does not.

When filtering becomes less effective or more effortful, background information may continue demanding attention.

The refrigerator hum.

The spoon.

The chair moving.

The conversation behind you.

The music.

The door.

Nothing agrees to remain in the background.

This can feel like every signal has arrived at the front desk simultaneously and is demanding to speak with management.

The problem is not necessarily extraordinary sensory acuity.

It may involve difficulty prioritizing, disengaging from or tolerating competing input.

Research with autistic adults describes complex sensory experiences that can involve difficulty diverting attention away from aversive stimuli, as well as significant effects on participation and daily life.

What Sensory Overload Can Look Like

Overload does not have one appearance.

It may become visible as:

irritability
covering the ears
closing the eyes
leaving suddenly
snapping at someone
crying
pacing
becoming unable to decide
repeating a movement
speaking less
losing words
appearing rude or distant
becoming very still
needing darkness
refusing touch
feeling nauseated
developing a headache
feeling panicked
shutting a door
cancelling plans
sleeping afterward

Some people become more active.

Others become less available.

Some remain outwardly composed while using enormous effort to continue.

A person may appear calm because they have become quiet.

They may also be one additional question away from needing to escape.

The Early Signals

Overload is easier to respond to before the system reaches its edge.

Early signals may include:

rereading the same sentence
increasing irritation at small sounds
turning screen brightness down repeatedly
losing track of conversation
wanting people to stop asking questions
jaw tension
rubbing the eyes
becoming unusually hot
difficulty finding words
taking longer to choose
seeking the edge of the room
stronger reactions to touch
a sudden need for silence
feeling that everything is "too close"
an urge to abandon the whole task

These signs do not prove sensory overload.

They can occur with fatigue, stress, migraine, anxiety and other conditions.

But they can serve as a useful early warning:

The current input may be exceeding the budget.

Responding early may require a smaller adjustment than recovering after the limit has been crossed.

The Overload Sequence

A common sequence looks something like this.

Stage 1: Friction

The environment becomes slightly harder to tolerate.

You adjust clothing.

Turn down brightness.

Move away from a sound.

Stage 2: Narrowing

Attention becomes less flexible.

Decisions become harder.

Conversation feels intrusive.

The main goal becomes getting through or getting out.

Stage 3: Protection

You may:

leave
cover your ears
become irritable
stop speaking
close your eyes
reject touch
repeat a familiar movement
become highly controlling
freeze

Stage 4: Aftermath

Afterward, you may feel:

exhausted
ashamed
headachy
tearful
numb
unable to socialize
in need of sleep
confused about why the reaction was so strong

The aftermath is part of the experience.

Removing the immediate stimulus may not restore capacity instantly.

The system may need time, reduced demand and physical basics before returning.

Overload Is Not a Character Problem

A person in overload may be told:

"You are overreacting."

"It is not that loud."

"Everyone else is fine."

"You were okay five minutes ago."

"Just ignore it."

These statements focus on whether the environment appears objectively tolerable to someone else.

But individual response depends on more than the average volume, brightness or crowd size.

Pain thresholds differ.

Hearing differs.

Neurology differs.

Health differs.

Capacity differs.

The person may also have concealed discomfort until concealment was no longer possible.

The fact that others tolerate an environment does not prove that everyone can process it at the same cost.

At the same time, validating overload does not mean every environment can always be changed completely.

The useful task is collaboration:

What can be reduced?

What can be predicted?

What can be chosen?

What recovery is needed?

What accommodation is reasonable?

Sensory Overload Is Not One Diagnosis

Sensory overload is discussed in connection with several conditions and experiences.

It should not be used to diagnose any of them.

Autism

Sensory differences are included among features that can occur in autism, including being more or less sensitive to light, sound, clothing, temperature and other input. Autistic people vary widely; sensory experience is not identical across the spectrum.

Someone experiencing overload is not therefore automatically autistic.

Autism is a developmental condition assessed through a much broader history and pattern.

ADHD

Research increasingly reports differences in sensory processing among people with ADHD, including greater average sensory sensitivity, avoidance, seeking and reduced registration in some groups.

These findings describe group-level associations.

They do not mean sensory overload confirms ADHD, nor that all people with ADHD share the same sensory profile.

Migraine

People with migraine may experience sensitivity to light, noise and smells, particularly during an episode. Visual motion and certain patterns can also be difficult for some people.

New or changing light and sound sensitivity accompanied by significant headaches deserves medical assessment rather than being treated only as nervous-system overload.

Acquired Brain Injury

Sensory sensitivity can occur following concussion and other acquired brain injuries and may affect daily functioning.

Persistent symptoms following head injury require qualified medical guidance.

ME/CFS and Post-Exertional Malaise

For some people with ME/CFS, sensory input such as light or sound may contribute to exertional load and symptom worsening.

Generic exposure or "push through it" advice may therefore be inappropriate.

Stress, Anxiety and Trauma

Stress can narrow attention and increase vigilance.

An anxious person may monitor sounds, expressions or movement for possible danger.

A trauma reminder may make a particular sensory cue feel highly significant.

But sensory overload should not automatically be called trauma.

The same reaction may have different roots.

Illness, Pain and Exhaustion

Anyone can become less tolerant of input when:

ill
sleep deprived
in pain
hungry
emotionally overwhelmed
recovering from intense work
experiencing medication effects

A person does not need a diagnostic label before reducing unnecessary input.

They may simply be at capacity.

Sensitivity Is Not the Same as Hearing Damage

Feeling overwhelmed by sound and being exposed to sound levels that can damage hearing are related but different issues.

A sound can feel intolerable without being loud enough to damage hearing.

A dangerously loud sound can also damage hearing even if someone tolerates it emotionally.

Hearing protection is appropriate around genuinely hazardous noise.

But wearing strong hearing protection continuously in ordinary environments without professional guidance may not be the right solution for every form of sound sensitivity.

The goal is not complete silence forever.

It is safe, sustainable input management appropriate to the cause.

Seek audiological or medical guidance for:

pain from ordinary sounds
tinnitus
sudden hearing changes
one-sided symptoms
dizziness
persistent sound intolerance
symptoms after loud-noise exposure

The Environment-First Principle

When a room is overwhelming, people often begin by trying to change themselves.

Breathe differently.

Think positively.

Remain calm.

Try harder.

But the fastest intervention may be environmental.

Turn one light off.

Close one browser tab.

Leave the television off during conversation.

Move away from the speaker.

Sit near the edge of the room.

Remove the clothing tag.

Open a window.

Ask for instructions in writing.

Reduce the number of choices.

Wear a cap or tinted lenses where appropriate.

Use comfortable hearing protection in a genuinely loud setting.

The nervous system processes the environment it receives.

Changing that environment is not cheating.

It is part of regulation.

Sensory First Aid

When overload is already building, use fewer steps.

Not more.

Step 1: Reduce One Major Input

Do not redesign the whole world.

Find the loudest channel.

Sound?

Light?

Touch?

Conversation?

Movement?

Decision-making?

Reduce that first.

Step 2: Stop Adding

Pause notifications.

Stop asking questions.

Do not begin a guided exercise with twelve instructions.

Do not demand an explanation.

Create fewer incoming signals.

Step 3: Increase Predictability

Say what will happen next.

Examples:

"We are leaving in two minutes."

"You do not need to answer now."

"I will turn the music off."

"We can sit here until you are ready."

Predictability reduces the need to monitor every possibility.

Step 4: Offer Two Choices

Not ten.

Examples:

"Quiet room or outside?"

"Do you want me nearby or farther away?"

"Water or no water?"

A choice can restore control.

Too many choices become more input.

Step 5: Allow Recovery

Do not expect immediate conversation, apology or analysis.

The person may need:

darkness
quiet
water
food
familiar movement
comfortable pressure
solitude
a trusted person nearby
sleep
time

Recovery is not necessarily complete when the stimulus stops.

The Two-Minute Input Reset

Use this when you notice early signs and are physically safe.

First 30 Seconds: Stop

Pause the task.

Put the phone face down.

Do not solve anything yet.

Next 30 Seconds: Identify the Loudest Channel

Ask:

What is costing the most right now?

Choose one.

Next 30 Seconds: Reduce It

Move.

Dim.

Mute.

Loosen clothing.

Close the door.

Stop conversation briefly.

Final 30 Seconds: Choose the Next Setting

Decide:

continue with less input
take a short break
leave
ask for help
postpone the task

The purpose is not complete calm.

It is to stop the budget from being spent faster than it can recover.

Sound: Reduce, Replace or Organize

When sound is the problem, complete silence is one option.

Not the only one.

Sometimes unpredictable sound is harder than steady sound.

A consistent background sound may help mask irregular noises for some people.

Others find white, pink or brown noise more irritating.

Research on noise and attention does not support one universal sound solution; effects differ between groups and individuals. A 2024 meta-analysis found small attention benefits from white or pink noise in people with ADHD or elevated ADHD symptoms, but not in people without ADHD, and the authors emphasized limitations and risks.

Try sound as an experiment.

Not a prescription.

Possible options:

silence
earplugs in appropriate settings
noise-reducing headphones
steady fan noise
low-volume brown or pink noise
quiet instrumental sound
one familiar track
moving away from overlapping conversation

Stop if a sound increases pressure, agitation, headache or tinnitus.

The WholeRoot Frequency Generator is a tool for sound exploration.

It is not a sensory-overload treatment.

A chosen tone may feel pleasant to one person and intolerable to another.

Volume and comfort matter more than mystical claims attached to a number.

Light: Brightness Is Only One Variable

When visual input is difficult, consider:

brightness
glare
flicker
color temperature
rapid motion
visual clutter
screen contrast
reflections
moving crowds
patterned surfaces

Possible adjustments:

move away from direct glare
use indirect lighting
reduce unnecessary screens
use device accessibility settings
slow animations
clear the immediate visual workspace
choose a less visually busy seat
wear a brimmed cap outside
discuss appropriate lenses with a qualified professional when symptoms are persistent

Do not spend all day in darkness solely to avoid every sensation without medical guidance.

Extreme avoidance can reduce participation and may complicate some conditions.

But forcing exposure during migraine, post-concussion symptoms or illness may also worsen symptoms.

The correct approach depends on the cause.

Touch and Clothing

Touch becomes especially difficult when it is unexpected or cannot be controlled.

Useful changes may include:

asking before touching
removing tags
choosing softer fabrics
loosening restrictive clothing
using familiar bedding
reducing crowd contact
allowing more personal space
choosing pressure only when wanted

Some people find firm, predictable pressure comfortable.

Others feel trapped by it.

Do not apply weighted blankets, compression or deep pressure to someone without consent.

Comfort is not universal.

Even hugs need consent.

Social Overload

A room can be quiet and still socially overwhelming.

Social processing may involve:

following facial expressions
interpreting tone
deciding when to speak
remembering names
hiding discomfort
responding quickly
monitoring whether you appear interested
tolerating unpredictable questions

Possible adjustments:

meet one person rather than a group
choose a quieter venue
set a clear finishing time
arrive early
sit near an exit
ask for the plan beforehand
take breaks without apology
use written communication
allow delayed responses
reduce simultaneous conversation

A person may enjoy people and still have limited capacity for social input.

Needing recovery after contact does not automatically mean disliking contact.

Decision Overload

Some environments are difficult because they require continuous choosing.

Menus.

Forms.

Instructions.

Notifications.

Products.

Routes.

Responses.

Plans.

When capacity is low, even minor choices can become expensive.

Reduce decision load by:

choosing from two options
using a prepared list
repeating familiar meals
deciding before entering the environment
writing the next step visibly
grouping similar tasks
postponing nonurgent choices
accepting "good enough"

Sometimes the kindest sensory adjustment is not quieter sound.

It is fewer decisions.

Masking the Cost

Some people become skilled at concealing sensory discomfort.

They smile.

Continue working.

Maintain conversation.

Remain still.

Say they are fine.

This can prevent others from recognizing how much effort the environment requires.

The visible reaction may appear only later:

exhaustion at home
headache
irritability
withdrawal
inability to complete another task
needing prolonged quiet
cancelling the next plan

The absence of a public reaction does not prove the environment was easy.

A useful question is:

What does it cost to appear unaffected?

Not everyone needs to display discomfort openly.

But ongoing concealment can make accommodation and recovery harder to obtain.

Avoidance Versus Accommodation

Reducing input is not automatically avoidance.

Leaving a painfully loud room is sensible.

Using written instructions can improve performance.

Choosing softer clothes is not a psychological failure.

An accommodation changes conditions so participation becomes more possible.

Avoidance becomes concerning when life continues shrinking and the person loses access to valued activities without an alternative plan or proper support.

Ask:

Does this change help me participate?
Does it preserve energy for what matters?
Is the environment genuinely unreasonable?
Am I avoiding every uncertain sensation?
Is my sensitivity increasing or changing?
Would professional guidance help?

The goal is not maximum tolerance.

It is sustainable participation.

Build a Sensory Buffer

A sensory buffer is extra capacity created before a demanding environment.

Before a crowded event, you might:

sleep adequately
eat
hydrate
reduce earlier commitments
know the schedule
choose transport in advance
bring ear protection
wear comfortable clothing
identify a quiet area
decide how long to stay
tell someone you may take breaks

The event may remain stimulating.

But fewer unknowns and stronger physical basics can reduce total cost.

Do not wait until overload to discover that the nearest quiet room is a locked cupboard containing a vacuum cleaner.

Plan the exit before you need the exit.

The Sensory Budget Worksheet

Today's Capacity

Rate loosely:

Rested
Usable
Reduced
Very limited

No exact score is needed.

Major Inputs Ahead

List:

sound
light
people
travel
screens
decisions
physical discomfort

Non-Negotiable Inputs

What must happen?

Optional Inputs

What can be removed or delayed?

Protective Resources

What can you bring?

food
water
headphones
sunglasses
written plan
familiar person
comfortable clothing
transport option

Exit Plan

How will you pause or leave?

This is not fragility planning.

It is resource planning.

A Sensory Recovery Menu

After a high-input period, do not automatically choose the same recovery every time.

For auditory load

quiet
one predictable sound
minimal conversation
no notifications

For visual load

softer lighting
reduced screen use
uncluttered space
stable visual focus

For social load

solitude
one trusted person
no required explanation
delayed messaging

For decision load

familiar food
one simple plan
no optional choices
written sequence

For physical discomfort

comfortable clothing
temperature adjustment
hydration
food
pain care

For accumulated overload

reduce the rest of the day
protect sleep
cancel nonessential input
record what contributed
consider accommodations

Recovery should reduce cost.

It does not need to look aesthetically peaceful.

Sometimes recovery is sitting in the car for five minutes with no radio and no one asking what is for dinner.

How to Support Someone in Overload

Use less language.

Do not stand too close.

Do not demand eye contact.

Do not touch without asking.

Do not explain why the environment should be tolerable.

Try:

"Would less sound or less light help?"

"We can leave."

"You do not need to answer right now."

"Do you want space or company?"

"I will ask one question at a time."

Keep your voice steady.

Not artificially slow and theatrical.

The person is overloaded, not asking for a performance.

If there is immediate danger, guide them toward safety using clear, simple information.

When Exposure Helps, and When It Does Not

People are sometimes told that avoiding discomfort will always make sensitivity worse.

That is too broad.

Gradual exposure can be useful for some fear-based avoidance patterns when carefully designed and connected to a clear diagnosis or treatment goal.

But not every sensory difficulty is primarily fear.

Exposure may be inappropriate or require specialist guidance when symptoms relate to:

migraine
acquired brain injury
ME/CFS
hearing conditions
vestibular conditions
severe pain
medical illness
trauma
developmental sensory differences

Do not create a self-directed "sensory boot camp" based on the assumption that distress proves the exercise is working.

The right question is not:

Can I endure more?

It is:

What is the cause, what is the goal and what level of input supports function without unnecessary harm?

When Sensitivity Needs Assessment

Speak with a qualified healthcare professional when sensory sensitivity:

begins suddenly
is becoming progressively stronger
follows a head injury
is accompanied by significant headaches
includes dizziness or balance problems
causes ear pain or hearing changes
is strongly one-sided
follows a medication change
interferes substantially with work or daily life
contributes to delayed physical crashes
appears with new neurological symptoms
causes severe anxiety or avoidance
has been present since childhood and raises broader developmental questions

Possible professionals may include:

primary-care clinicians
neurologists
audiologists
occupational therapists
psychologists
psychiatrists
optometrists or ophthalmologists
vestibular specialists

The appropriate pathway depends on the symptoms.

Sensory overload is the beginning of a description.

Not the end of the assessment.

Urgent Warning Signs

Seek urgent medical care for sudden sensory changes accompanied by:

weakness
facial drooping
speech difficulty
confusion
loss of consciousness
severe sudden headache
new vision loss
inability to walk
severe dizziness
symptoms after significant head injury

Do not interpret sudden neurological symptoms as stress or nervous-system dysregulation without urgent evaluation.

The WholeRoot Sensory Map

When input is intense

Reduce intensity.

When input is prolonged

Take breaks before capacity disappears.

When input is complex

Simplify the scene.

When input is unpredictable

Add a plan.

When control is low

Create choices and exits.

When capacity is reduced

Protect the basics and remove optional demands.

When symptoms are new or severe

Investigate medically.

When accommodations increase participation

Use them without shame.

When avoidance keeps shrinking life

Seek a more supported plan.

This map does not identify one perfect sensory environment.

It helps create a workable relationship between the person and the environment.

Try This in the Next Overwhelming Room

Do not begin by asking yourself to tolerate everything.

Ask:

Which channel is costing the most?

Sound?

Light?

Touch?

Smell?

Movement?

People?

Decisions?

Then reduce one channel.

Not all seven.

Move away from the speaker.

Turn off one light.

Stop the conversation temporarily.

Put the phone away.

Choose from two options.

Leave the room.

Notice whether capacity changes.

Then ask a second question:

Was the environment too much, or was I already nearly full when I entered it?

Both answers matter.

The first helps change the environment.

The second helps plan the day.

The WholeRoot Reminder

Sensory overload is not weakness.

It is not always trauma.

It is not always autism.

It is not always anxiety.

It is not one diagnosis and does not have one mechanism.

It is an experience that can emerge when incoming demands and available capacity no longer fit.

The work is not to become invulnerable to light, sound, people and every demanding environment.

The work is to become more accurate.

Accurate about what is entering.

Accurate about what it costs.

Accurate about what can be changed.

Accurate about when recovery is needed.

Accurate about when symptoms deserve assessment.

Sometimes the most regulating practice is inside the body.

Sometimes it is turning down the music.

Sometimes it is eating before entering the supermarket.

Sometimes it is written instructions.

Sometimes it is leaving early.

Sometimes it is discovering that the sensitivity is part of a medical or developmental picture that deserves real support.

The nervous system does not process life in isolation.

It processes the environment.

So let the environment become part of the solution.

Keep Exploring

Return to Nervous System Hub: Start Here for the wider map.

Need the foundation first? Read Nervous System Basics Without the Jargon.

Trying to choose the right direction? Read Regulation vs. Relaxation: Calm Is Not Always the Goal.

If high-input environments leave you flat or depleted afterward, read Numb, Flat or Shut Down.

Exploring sound carefully? Open the WholeRoot Frequency Generator with comfort, volume and realism in mind.

If you need a lower-input practice, try Grounding for Stress: A 5-Minute Nervous System Reset.