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How Long Can You Go Without Sleep? [Exploring The Limits]

By: Susie
Updated On: November 1, 2023

Have you ever pulled an all-nighter to meet a project deadline or simply because you were enjoying the latest binge-worthy series way too much?

If so, the question "How long can you go without sleep?" has probably crossed your mind. Well, whether you are burning the midnight oil by choice or out of obligation, it’s essential to understand what your body can handle and the consequences of forsaking sleep.

From driving drowsiness to impaired cognitive functions, lack of sufficient sleep can have a significant impact on your overall well-being.

Parsing through scientific studies and health statistics will give insight into the maximum length of time a person can stay awake, as well as underline the importance of good sleep hygiene in maintaining a healthy and productive lifestyle.

How Long Can You Go Without Sleep?

The record for the longest time a person has gone without sleep is held by Randy Gardner, a high school student who managed to stay awake for 264 hours, or approximately 11 days, for a science project.

It's important to note that lack of sleep can have serious health impacts, such as cognitive impairments, mood disturbances, and physical health consequences.

It is recommended that an average adult should receive between 7-9 hours of sleep per night.

What are the side effects of Staying Without Sleep?

Lack of sufficient sleep can have serious health impacts, both in the short term and over a longer period. Here are the key side effects:

What are the side effects of Staying Without Sleep?
  • Cognitive Impairments: Insufficient sleep affects cognitive processes in many ways. It impairs attention, alertness, concentration, reasoning, and problem-solving. This makes it more difficult to learn efficiently.
  • Memory Issues: During sleep, your brain forms connections that help you process and remember new information. A lack of sleep can negatively impact both short-term and long-term memory.
  • Mood Alterations: Sleep deprivation can affect your mood, leading to irritability, anxiety, and depression.
  • Weakened Immunity: Skimping on sleep can impair your body's ability to fight off infections.
  • High Blood Pressure: Having less than five hours of sleep a night for an extended period could increase your chances of developing high blood pressure.
  • Weight Gain: Lack of sleep could cause you to gain weight by affecting the way your body processes and stores carbohydrates and altering hormones that affect your appetite.
  • Increased Risk of Diabetes: Lack of sleep may lead to type 2 diabetes by affecting the way your body processes glucose, which is the carbohydrate our cells use for fuel.
  • Impact on Sex Drive: Sleep specialists say that sleep-deprived men and women report lower libido and decreased interest in sex.
  • Risk of Heart Disease: Serious sleep disorders have been linked to hypertension, increased stress hormone levels, and irregular heartbeat, all increasing the risk of heart disease.
  • Impaired Balance: Lack of sleep can affect balance and coordination, making you more prone to falls or other physical accidents.

Regular, quality sleep is crucial for health - aim for seven to nine hours per night.

Also Read: Is One Hour Of Sleep Better Than None? [Count As A Nap?] 2023

The First 24 Hours Without Sleep: Side-Effects

Embarking on a 24-hour sleepless journey might seem achievable, especially if you have deadlines pressing on your shoulders.

Pulling an all-nighter is nothing out of the ordinary in our modern, fast-paced society.

Staying awake for a full 24 hours isn't as harmless as it seems. Various side effects start to creep in and affect your physical and mental well-being.

  • Fatigue: You'll feel tired and sluggish, making even basic tasks seem more strenuous.
  • Irritability: Things that would usually not bother you might suddenly seem annoying or frustrating.
  • Drowsiness and brain fog: You may experience a sense of "clouded" thinking, making it harder for you to concentrate or make decisions.
  • Lower attention span: Your ability to focus on tasks will significantly decrease, leading to decreased productivity.
  • Cognitive impairment: High-level cognitive functions like memory, creativity, and problem-solving skills will start to dwindle.
  • Impaired vision and hearing: Studies show that lack of sleep can cause blurry vision and lower sensitivity to sounds around you.
  • Lack of good judgment: Decision-making skills take a serious hit when sleep-deprived. Small decisions might become overwhelming tasks.
  • Tremors: Some people may experience slight trembling or shaking in their extremities due to excessive tiredness.

Sleep performs multiple crucial functions in our body, from cellular repair processes supporting immune function to maintaining cognitive functions like memory consolidation, attention span maintenance, and decision-making process efficiency.

36 Hours Without Sleep: Side Effects

If you've ever marveled at your ability to stay alert after a full day and night without sleep, you might want to think again.

Around the 36-hour mark of sleep deprivation, your body starts to show signs that it's not too happy with this new arrangement, and the impact is hard to ignore.

  • All previous symptoms: If you thought the symptoms at the 24-hour mark were intense, they only get worse. Fatigue, irritability, drowsiness, brain fog, lower attention span, and impaired vision - they're all still there, just intensified.
  • Hormone imbalances: The disruption of your natural sleep cycle impacts hormone production across the board. This can trigger mood swings, anxiety, or even depression.
  • Slow metabolism: Your body's metabolism also takes a hit when you're running on empty. It struggles to convert carbohydrates into energy, leading people to feel lethargic and weak.
  • Increased appetite: Ever notice how much hungrier you get when you're tired? That's because lack of sleep increases ghrelin - a hormone that stimulates appetite - while lowering leptin - a hormone that signals satiety.
  • High blood pressure: With stress hormones on the rise and relaxation-inducing hormones dipping low, high blood pressure becomes a possibility due to both physical stress and hormonal imbalance.
  • Fluctuations in body temperature: Expect hot flushes and chills. This occurs as your thermoregulatory system gets affected due to a lack of rest.
  • Speech impairment: Saying "I am too tired for this!" may start sounding slurred or slowly spoken due to reduced coordination between brain function and muscle response.
  • Microsleep episodes: Microsleep is an uncontrollable response where you may suddenly 'check out' for a few seconds without realizing it—this translates into an increased risk for accidents.

The bottom line is that at 36 hours without sleep, you're inviting potentially harmful physiological and psychological changes.

So, the next time an all-nighter beckons, it would be good to consider the adverse effects felt after this period.

48 Hours Without Sleep: Side Effects

Crossing the 48-hour mark without sleep is when things start becoming highly concerning. The effects are more pronounced now.

They go beyond just feeling cranky and spacy, which are still very much present as your body and mind continue to demand the sleep they've been denied.

  • All previous symptoms: All the symptoms you start to experience after 24 hours – fatigue, irritability, drowsiness, brain fog, reduced attention span, cognitive impairment, impaired vision and hearing, lack of good judgment, and tremors – continue to amplify at an alarming rate.
  • More frequent microsleep episodes: At this point, your body forces you into periods of 'microsleep,' characterized by brief episodes of sleep that last from a fraction of a second up to 30 seconds. During these episodes, you might not even be aware that you nodded off.
  • Impaired immune system: Your immune system takes a major hit after this prolonged period of wakefulness. You become much more vulnerable to illness as your body's defense mechanism struggles to operate efficiently without rest.
  • Low overall performance: As you push past the normal cycles of day and night without sleep, serious functional impairments start setting in. Your performance, both physically and cognitively, takes a downward spiral.
  • Depersonalization: Commonly experienced with extreme sleep deprivation is a sense of depersonalization or derealization. You might feel detached from yourself or perceive reality in a distorted way.
  • Extreme mood swings: Last but most disturbingly drastic are changes in mood that can frequently swing from one extreme to another — increased anxiety, irritability, frustration, or even unexpected moments of euphoria.

After staying awake continuously for two full days and nights, it becomes nearly impossible for one's physiological systems (immune system operation included) or cognitive abilities (like focus, decision-making, short-term and even long-term memory tasks) to function normally.

Your body's cry for sleep becomes loud and, more importantly, potentially life-threatening if that rest continues to be denied.

72 Hours Without Sleep: Side-effects

By the time you hit the 72-hour mark without sleep, it's as if you've entered a whole new world - unfortunately, not in an exciting Aladdin style.

Your previous symptoms not only persist but become increasingly aggravated. The physical and mental impacts are severe enough to noticeably alter your awareness of your surroundings and your bodily functions.

  • All previous symptoms intensify: All those side effects - irritability, foggy thinking, drowsiness, impaired vision, and hearing all get worse. Combine these with emotional instability and cognitive impairment, and it's safe to say that by 72 hours with no sleep, you are far from your best self.
  • Longer microsleep episodes: As mentioned earlier, microsleep refers to uncontrollable short bursts of sleep that last anywhere from a fraction of a second to half a minute. By this point in your sleep deprivation experiment, these episodes become more prolonged and frequent. You literally doze off without knowing it or having any control over it.
  • Difficulty interpreting the world around you: Let's be clear here - we're talking about seriously blurred perceptions. It becomes challenging to grasp details about what is happening around you or even who is around you. This ultimately leads to confusion, disorientation, and a heightened risk of accidents or mistakes.
  • General body dysfunction: Just like a machine needing regular maintenance and rest periods to function correctly, your body also needs breaks in the form of sleep. After three days without the necessary 'shut down,' many physiological processes start faltering – blood pressure fluctuates erratically; immune system resilience takes a downturn; hormone imbalances wreak havoc on emotions; digestion becomes irregular; even skin health can be adversely affected as toxins aren’t cleared as efficiently from the body.

To further illustrate this dire scenario, A study conducted by PLoS ONE mentions that 3 full nights without sleep can cause diminished cognitive functioning, equivalent to having a blood alcohol concentration of 0.1% - legally drunk in the United States.

How Many Sleep Hours Does the Human Body Really Need?

You've probably heard that most adults function best with seven to nine hours of shut-eye. Well, though this is a widely accepted range, each person's sleep requirement is as unique as their fingerprint.

How Many Sleep Hours Does the Human Body Really Need?

Factors such as age, lifestyle, physical activity levels, and overall health play a significant role in determining how much sleep is optimal for you.

But the bottom line remains: adequate sleep is non-negotiable when it comes to your health and well-being.

AgeDaily Sleep Recommendations
Newborns14-17 hours
Infants12-16 hours
Toddlers11-14 hours
Preschool-age children10-13 hours
School-age children9-12 hours
Teens8-10 hours
Adults7-9 hours

Read More: 10 Best Mattress Toppers for Side Sleepers 2023 [Top Picks]

The Unbeatable Benefits of Proper Sleep

Sleep is more than just a time-out from our busy, daily schedules; it's an essential component for our body and mind to regenerate and maintain optimal health.

The Unbeatable Benefits of Proper Sleep

While you drift away into dreamland, your body busily repairs cells revitalizes the immune system, replenishes energy reserves, and performs countless other crucial tasks.

  • Improved Memory: Your brain uses the quiet period during sleep to consolidate different referrals. It's the time when your recent memories get transferred and stored in more permanent regions of the brain.
  • Enhanced Cognitive Function: A good night’s sleep leaves you waking up alert and receptive. Adequate rest has a direct impact on concentration, problem-solving skills, and overall cognitive functionality.
  • Emotional Stability: Lack of sleep can leave you cranky or overly emotional. It fuels your brain's emotional centers while hitting the brakes on the rational decision-making zones.
  • Physical Health Maintenance: Regular bouts of deep sleep help maintain balance in everything from blood sugar levels to blood pressure.
  • Lowered Stress Levels: Adequate rest reduces levels of stress hormones in our bodies, resulting in a lower risk of heart disease.
  • Immune System Support: Quality slumber helps fend off infections by boosting your immune system.
  • Weight Management: Lack of sleep disrupts hormones that control hunger prompts.
  • Improved Mood and Increased Productivity: A well-rested individual is bound to be happier, more productive, and more resilient than somebody who missed out on quality sleep.
  • Enhanced Athletic Performance: Improved athletic performance is linked to athletes who get enough sleep; benefits include increased speed, accuracy, reaction times, and mental well-being.
  • Reduced Inflammation: Studies have found that people with short sleep duration have slightly higher levels of inflammatory proteins than those who sleep adequately.
  • Cell Repair and Growth Stimulation: Your body releases repair hormones during sleep. This hormone helps build muscle mass, fight infections, and heal wounds.
  • Better Decision-making skills: Sleep tunes up your brain's decision-making and problem-solving techniques.

Sleep deprivation commonly leads to chronic diseases such as diabetes, heart disease, stroke, or even death. At the same time, optimum sleep enhances creativity levels.

During the REM phase of sleep, where dreams occur, your brain creatively connects new ideas with old ones, leading to sudden insightful solutions to problems.

When you sleep well, your attention span lengthens to give you a crisp clarity of mind throughout the day. Greater focus means a lower risk of accidents.

Explore More: 10 Best Mattress Toppers for Side Sleepers 2023 [Top Picks]

FAQs about How Long Can You Go Without Sleep?

Why is sleep crucial for our health?

Sleep is important because it allows the body to repair itself and prepare for another day. Getting adequate rest may help ward off chronic disease and improve overall health and wellness.

What happens to your body during a 'pulling an all-nighter'?

Staying up all night can negatively impact cognitive function, decrease attention span, impair vision, and cause mood shifts or even hallucinations in severe cases.

What are some dangerous health effects of chronic sleep deprivation?

Chronic sleep deprivation can lead to serious health conditions, such as heart disease, diabetes, stroke, Alzheimer's disease, obesity, depression, and even certain types of cancer.

What's the longest someone has ever gone without sleep voluntarily?

The record for voluntary sleep deprivation is 11 days (264 hours) set by Randy Gardner in 1964.

Can loss of sleep lead to weight gain?

Yes, lack of sleep can disrupt hormones that control hunger prompts, potentially leading to an increased appetite and subsequent weight gain.


While pulling an all-nighter occasionally might seem harmless, regular sleep deprivation can have far-reaching consequences for your physical and mental health.

Your body and mind need that restful period to repair, regenerate, and reboot. So, embrace the unbeatable benefits of a proper good night's rest to enjoy improved memory recall, enhanced cognitive functions, emotional stability, and overall better health.

The value of quality sleep goes beyond just eliminating under-eye circles; it plays a critical role in your overall well-being.

”Sleep is the golden chain that ties health and our bodies together,” as Thomas Dekker once said. So follow suit: recharge your brain by participating in one of life's free luxuries.

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