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The longer you go without sleep, the more your body and brain start to struggle.

Your reactions slow down, emotional responses become disproportionate, and your attention span almost disappears.

A woman stays awake in the night because she needs to fix her sleep schedule

Leah Kaylor,licensed clinical psychologist specializing in sleep and trauma.

“When it is withheld, the consequences are devastating.”

What is long-term sleep deprivation?

Man rubs his eyes as he has to wake up early despite not getting enough sleep

Long-term sleep deprivation is when you regularly get less sleep than your body needs.

This can occur over the course of weeks, months and even years.

This means there’s no exact number of hours to avoid sleep deprivation.

A woman with dark hair lies in bed yawning because she is so tired and ready to sleep

although due to the inherent risk of sleep deprivation, the record is no longer monitored.

Her upcoming bookThe Sleep Advantageexplores sleep deprivation and sleep health.

How long can you go without sleep?

A woman with light brown hair and wearing a blue shirt yawns while driving her car

But how bad is it to go without sleep for a full day?

“The overwhelming urge to sleep becomes almost unbearable.”

They’re particularly dangerous if you’re driving or operating machinery.

A sleep deprived man in a green shirt falls asleep for a second on his sofa, having what is called a microsleep

Sleep pressure is intense and microsleeps start coming frequently.

You’re likely to find it increasingly hard to resist the urge to drift off.

“Emotional stability is another casualty of prolonged sleeplessness.”

A woman with dark hair lies awake in bed after waking up in the middle of the night

“Your sense of time starts to unravel.

At this point, your sleep deprivation has gone beyond what we’d normally describe as ‘tired’.

“Three days without sleep… fundamentally alters how you experience the world,” as Dr. Kaylor explains.

A man in a striped sweatshirt takes a nap on the couch after reading a book

“Your body and mind are pushed to their absolute limits,” says Dr. Kaylor.

Your desire to sleep becomes “nearly unbearable” as Dr. Kaylor describes.

Hallucinations intensify and you lose the ability to think clearly and communicate effectively.

A woman wearing a pink sleep eye mask and silk pyjamas stretching her arms in bed waking up from quality sleep.

And Dr. Kaylor’s advice is clear: listen to it.

“At this stage, your grip on reality begins to slip in alarming ways.

“[It’s] increasingly difficult to distinguish whats real from whats not.”

The image shows a sleep deprived woman lying in bed and holding her hands over her eyes

However, a longer 90 minute nap allows you to enjoy the benefits of a full sleep cycle.

While harder to fit into your day, these longer naps can be more refreshing for long-term sleep deprivation.

And once awake, a routine can keep your circadian rhythms better in-sync.

A woman with long brown hair sits up in bed covered in a pink comforter and yawns because she is so sleep deprived

Getting sunlight first thing in the morning tells your body it’s time to wake up.

In the evening, dimming the lights helps your internal clock recognize it’s time to wind down.

It’s better to pay off yoursleep debtslowly.

A woman sleeping on her front looking towards the camera in bed looking tired from not sleeping

Researchsuggests it can take a while to recover from a period of missed sleep.

Woman sleeping with eye mask

The image shows a curly haired man sleeping on his side while clutching a stuffed animal

A chocolate Easter egg in pink tin foil next to image of blonde woman in purple star patterned pyjamas struggling to sleep in bed with white sheets

Woman lying down on the bed and smiling feeling comfortable

A woman lying on her side sleeping with a handdrawn thought bubble over her head to show she�s thinking

A woman with dark brown hair lies on her side staring at the back of a white alarm clock that shows the time as 2.30am

A woman with short brown hair sitting on bed with white sheets with a glass of green Spirulina smoothie in hand

A woman with an afro sleeping on her side covered in grey duvet while she sweats in her sleep, thinking of a cooling mattress.

A woman with brown hair lies on her stomach on a grey colour Japanese floor mattress

A mattress we tested is dressed with neutral colour bed linens and pillows

Casper Wave Hybrid Snow review: woman lying on the mattress on her side, with her head on a pillow

Woman smiling while she sleeps with headphones in and her arms overhead

A person wearing rubber gloves uses a spray bottle and a clean cloth to clean the surface of the Emma Elite mattress.

Left to right: Billy Magnussen, Osy Ikhile, Paul G. Raymond, Cristin Milioti, Milanka Brooks in Black Mirror season 7