Header burger open
Search Logo

Jump To

Currently Viewing:

How Long Can A Person Stay Awake At Most?

a profile image of TSA author Alex

Written By Alex Petrović

Sleep Consultant

Tired woman

13 November 2023 5 min read

When it comes to time-consuming activities, there’s one that sits head and shoulders above them all. Live to 78, and you may have spent around 25 years asleep. Exactly why the urge to sleep is so strong remains a mystery.

The exact function of sleep is still to be scientifically found. However, there is something about sleep that seems to “reset” systems in our bodies. What’s more, studies have shown that routine and adequate sleep promotes healing, immune function, proper metabolism, and much more. Maybe that’s why it feels good to arise refreshed after an afternoon snooze. In an effort to claw back some of that time it’s reasonable to ask: how long can we stay awake – and what are the consequences of going without sleep?

How long can we stay awake?

The easy experimental answer to this question is 264 hours (about 11 days). In 1965, Randy Gardner, a 17-year-old high school student, set this apparent world record for a science fair. Several other normal research subjects have remained awake for eight to 10 days in carefully monitored experiments. None of these individuals experienced serious medical, neurological, physiological or psychiatric problems. On the other hand, all of them showed progressive and significant deficits in concentration, motivation, perception and other higher mental processes as the duration of sleep deprivation increased. Nevertheless, all experimental subjects recovered to relative normality within one or two nights of recovery sleep. Other anecdotal reports describe soldiers staying awake for four days in battle, or unmedicated patients with mania going without sleep for three to four days.

an image of a woman drinking coffee to stay awake

Various states of being awake

The more difficult answer to this question revolves around the definition of “awake.” As mentioned above, prolonged sleep deprivation in normal subjects induces altered states of consciousness (often described as “microsleep”), numerous brief episodes of overwhelming sleep, and loss of cognitive and motor functions. We all know about the dangerous, drowsy driver. We’ve definitely heard about sleep-deprived British pilots who crashed their planes (having fallen asleep) while flying home from the war zone during World War II. Randy Gardner was “awake” but basically cognitively dysfunctional at the end of his ordeal.

Sleep affecting disorders

In certain rare human medical disorders, the question of how long people can remain awake raises other surprising answers, and more questions. Morvans fibrillary chorea or Morvans syndrome is characterized by muscle twitching, pain, sweating, weight loss, hallucinations, and severe loss of sleep. Physicians in Lyon, France, studied a 27-year-old man with this disorder and found he had virtually no sleep over a period of several months. During that time he did not feel sleepy or tired and did not show any disorders of mood, memory, or anxiety. Nevertheless, nearly every night between 9:00 and 11:00 p.m., he experienced a 20 to 60-minute period of auditory, visual, olfactory, and somesthetic (sense of touch) hallucinations, as well as pain and vasoconstriction in his fingers and toes. In recent investigations, Morvans Syndrome has been attributed to serum antibodies directed against specific potassium (K+) channels in cell and nerve membranes.

Another rare disorder, Fatal Familial Insomnia (FFI), is an autosomal dominate disease that is invariably fatal after about six to 30 months without sleep. FFI is probably misnamed because death results from multiple organ failure, rather than sleep deprivation. The pathological processes include degeneration of the thalamus and other brain areas, over-activity of the sympathetic nervous system, hypertension, fever, tremors, stupor, weight loss, and disruption of the body’s endocrine systems. FFI belongs to a class of infectious prion diseases that include Mad Cow Disease.

What happens to us when we don't sleep for enough days?

Due to the lack of sleep, or body reacts gradually. We start feeling the effects of lack of sleep after the first 24 hours. Let's examine this a bit more in detail.

At 24 hours: Impaired coordination, memory and judgement

The consequences of sleep deprivation at 24 hours is comparable to the cognitive impairment of someone with a blood alcohol content of 0.10 percent. Judgment is affected, memory is impaired, there is deterioration in decision-making, and a decline in eye-hand coordination. You’re more emotional, attention is decreased, hearing is impaired… There is also an increase in your risk of death from a fatal accident.

a woman feels sleepy after the first 24 hours of lack of sleep

At 36 hours: Physical health starts to be negatively impacted

Now your health begins to be at risk. High levels of inflammatory markers are in the bloodstream, which can eventually lead to cardiovascular disease and high blood pressure. Additionally, hormones are affected — your emotions can be all over the place.

a woman after 48 hours of lack of sleep

At 48 hours: Microsleeps and disorientation

After two days of no sleep the body begins compensating by shutting down for microsleeps. These episodes last from half a second to half a minute and are usually followed by a period of disorientation. The person experiencing a microsleep falls asleep regardless of the activity they are engaged in. Microsleeps are similar to blackouts, and a person experiencing them is not consciously aware that they're occurring.

an image of a man sleeping in his car

At 72 hours: Major cognitive deficits and hallucinations

Expect significant deficits in concentration, motivation, perception, and other higher mental processes after many sleepless hours. Even simple conversations can be a chore. This is when the mind is ripe for hallucinations.

So, how long can we endure without sleep?

Ultimately, we do not know. Sleep science is a young discipline. Only in the last few decades have we really started to understand the importance and functions of sleep. In the 1960s a high school student named Randy Gardner set out to break the world record for the longest time spent awake. During the experiment he contracted problems with eyesight as well as various cognitive deficiencies, such as speech and memory problems. Towards the end of the experiment he also started to hallucinate. These symptoms emerged within just 11 days.
What we do know is that it is unwise to ignore our need for sleep. The negative side effects of partial sleep deprivation have been observed in in countless research studies. It is safe to assume that these would only be worsened by prolonged total sleep deprivation.

Comments (0)

There are no comments yet

Related Posts

Articles you don’t want to miss

Featured image for mattress cover 101
07 November 2023

Mattress Cover 101

While you might find a wide selection of mattress covers, what you get can differ slightly depending on the store or website you get it from...
Featured image for Sofa beds with storage
01 November 2023

Sofa Beds With Storage: The Ultimate Guide

Some sofa beds will have two separate parts, with the "bed section" on top and independent drawers on the bottom. This means that figuring o...
Don't Miss Out!
Get the latest reviews, special offers, new releases and more…
@thesleepadvisors
Deal Alert!
We loved this Deluxe microfibre duvet from Otty. And we love it more now that it's on Black Friday sale!
Hit the link in bio to check this deal and all the rest this Black Friday

#DealAlert #BlackFridaySale #MicrofibreDuvet #Otty #DeluxeQuality #SleepInStyle #ComfyBedding  #LuxurySleep #BlackFridayDeals #Discounts #ShopTillYouDrop #BedroomUpgrade #HomeDecor #CozyNights #SleepWell #BedroomGoals #LimitedTimeOffer #SaveBig #BestDeals #OnlineShopping #BargainHunting #MustHaveItem #SaleAlert  #SleepInComfort #BudgetFriendly #ShopSmart #DuvetLove #BlackFridaySpecials  #GetItWhileItsHot #HomeComforts
Shhhh.... I'll tell you a secret! Black Friday isn't over!
We've rounded up the stragglers to cater for your Black Friday FOMO. 
Mattresses, Beds & Bedding are still on MAJOR discounts, so don't delay! Get a bargain today.

Links in bio

#BlackFriday #SecretDeals #MattressSale #BedSale #BeddingSale #Discounts #Bargains #BlackFridayFOMO #MajorDiscounts #StillOnSale #LimitedTimeOnly #DealAlert #ShopSmart #SaveMoney #SleepBetter #QualitySleep #LuxuryBedding #ComfortableMattress #GoodNightSleep #BedroomUpgrades #HomeDecor #InteriorDesign #HappyCustomers #OnlineShopping #Convenience #LinkInBio #Don'tMissOut #ShopNow #GetABargain #GreatDeals
Mattress Deal Alert! 
Here are some top value deals we've sniffed out for you this Black Friday!
We love these from Emma, but they're not all! Check our Black Friday deal summary for all the best bed and mattress deals to save you money and upgrade your snooze this Black Friday!

#MattressDealAlert #BlackFriday #TopValueDeals #EmmaMattress #BlackFridayDeals #BedDeals #MattressDeals #SaveMoney #UpgradeYourSnooze #BestDeals #SleepBetter #SnoozeBetter #BlackFridayShopping #Bargains #BigSavings #HotDeals #LimitedTimeOffer #Discounts #SaleAlert #SleepComfortably #SaveBig #MustHaveDeals #BlackFridaySales #GreatOffers #DreamBedroom #ComfortableSleep #BudgetFriendlyDeals #QualityMattress #SleepHappy
Best Mattresses With Edge Support UK – Top 5 Picks Reviewed 💤

The best mattress with edge support UK has to offer is… Well, let's not get that ahead of ourselves. First, let's understand what edge support is and why it might be important to you!  Check out the link in BIO🔗

#thesleepadvisors #sleep #sleeping #edgesupport #mattresses #topmattresses
Don't snooze! Well.... not yet! First pick up a bargain in the Black Friday sales! 
We've rounded up all the best deals to save you searching. You can find them all at the links in bio... then snooze your little socks off!

#BlackFridayDeals #BargainHunting #Savings #DealFinder #BlackFridaySales #ShopTillYouDrop #Discounts #BestDeals #LimitedTimeOffers #BigSavings #MoneySavingTips #OnlineShopping #SalesAlert #HolidayShopping #ShopSmart #ShopOnline #EarlyBirdGetsTheDeal #MustHaveItems #HolidayGifts #ShoppingSpree #Don'tMissOut #ClearanceSale #BiggestSaleOfTheYear #GetThemandSave #ScoreABargainGiveaway
Do you sleep on your tummy? On the side? Or on your back?
Can a topper suit your sleeping position & improve your sleep?
With 15% Off for Black Friday, the Panda Mattress Topper is worth a try!

#thesleepadvisors #topper  #mattresstopper #saggymattress #panda #sleepingpositio
Beat the queues and get your black Friday shopping done early!
You won't miss out as we've pulled this year's best deals together in one handy page. You'll find it on the link in bio

#blackfridaydeals #blackfridaysale #mattress
You can make or break your bedroom style with the perfect bed! What can make this easier? A HUGE Black Friday discount on your chosen bed frame of course!
From Ottoman to Sofa Beds, Metal or Wooden. The Sleep Advisors have pulled together the best in beds this Black Friday and here they are.
Link in bio

#bedroomstyle #perfectbed #BlackFridaydiscount #bedframe #Ottomanbeds #SofaBeds #Metalbeds #Woodenbeds #SleepAdvisors #bestinbeds #BlackFridayDeals #FurnitureSale #interiordecor #comfortablebed #sleepwell #homeimprovement #dreambedroom #discountshopping #shoppingtime #homefurnishings #cozybedroom #interiordesignideas #bedroominspo #masterbedroom #comfybedroom #sleepingbeauty #bedroomupgrade #relaxationstation #styleandcomfort #sweetdreams
Black Friday deal alert!
Get 15% discount on the award-winning Panda Hybrid Bamboo Mattress Topper!

#BlackFriday #DealAlert #Discount #PandaHybrid #BambooMattress #MattressTopper #SleepBetter #BedroomUpgrade #LuxurySleep #Sale #LimitedTimeOffer #SleepComfortably #SaveMoney #QualitySleep #ComfortableBedding #NaturalMaterials #SustainableChoice #EcoFriendlyMattressTopper #AffordableLuxury #BestPrice #HolidayShopping #HomeDecor #GreatDeal #BlackFridaySale #LimitedStock #InnovativeDesign #PremiumQuality #SleepWell #CozyBedding #BetterSleepingExperience
Do you sleep on your tummy? On the side? Or on your back? Can a topper suit your sleeping positions, and improve your sleep? Let’s find out! Check out the link in our BIO
#thesleepadvisors #topper #mattresstopper #saggymattress #panda #sleepingposition
Close button

Don't Miss Out!

Get the latest reviews, special offers, new releases and more…

By submitting this form, you are opting into our mailing lists.
See our privacy policy.

This field is for validation purposes and should be left unchanged.