Home / Sleep Topics / Sleep Deprivation

Updated November 4, 2020

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Dr. Alex Dimitriu

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Eric Suni

Almost everyone has encountered a zombie-like feeling after a night of minimal or no sleep. Even after just one night without enough rest, we can feel drowsy during the day with slowed thinking, lack of energy, and an irritable mood.

Sleep deprivation is when you don’t get the sleep you need, and it is It’s estimated to affect around one-third of American adults , a problem that has only worsened in recent years.

Lack of sleep directly affects how we think and feel. While the short-term impacts are more noticeable, chronic sleep deprivation can heighten the long-term risk of physical and mental health problems.

To avoid these problems, it’s important to avoid sleep deprivation. Understanding this condition, including its causes, symptoms, diagnosis, and treatment can put you in a better position to ensure that you’re getting the sleep you need.

What is Sleep Deprivation?

The term sleep deprivation refers to getting less than the needed amount of sleep, which, for adults, ranges from seven to nine hours of sleep per night. Children and teens need even more nightly sleep than adults.

Are All Definitions of Sleep Deprivation the Same?

In sleep medicine, sleep deprivation is defined based on sleep duration, which is the total amount of time a person spends asleep. In reality, though, being well-rested is about more than just how many hours you sleep. As a result, the terms sleep deficiency or sleep insufficiency are more frequently used to describe factors that reduce the quantity and/or quality of sleep and keep a person from waking up refreshed.

In this way, sleep deficiency has a broader application. For example, a person who sleeps for a total of eight hours but with many awakenings that fragment their sleep may have insufficient sleep even though their sleep duration technically meets the recommended amount.

This terminology can be distinct from everyday conversation in which the term sleep deprivation may be used with a wider meaning that refers to poor sleep overall and not just total sleep duration.

Even in the medical field, studies may use different technical definitions of sleep deprivation as some classify it as seven hours of sleep or fewer while others use six hours as the cutoff.

 Are There Different Types of Sleep Deprivation?

Sleep deprivation and sleep insufficiency may be categorized in different ways depending on a person’s circumstances.

  • Acute sleep deprivation refers to a short period, usually a few days or less, when a person has a significant reduction in their sleep time.
  • Chronic sleep deprivation, also known as insufficient sleep syndrome, is defined by the American Academy of Sleep Medicine as curtailed sleep that persists for three months or longer.
  • Chronic sleep deficiency or insufficient sleep can describe ongoing sleep deprivation as well as poor sleep that occurs because of sleep fragmentation or other disruptions.

 Is Sleep Deprivation Different From Insomnia?

While both insomnia and sleep deprivation involve failing to get enough sleep, many experts in sleep science make a distinction between them. People with insomnia have trouble sleeping even when they have plenty of time to sleep. On the other hand, people with sleep deprivation don’t have enough time allocated for sleep as a result of behavior choices or everyday obligations.

An illustration of this difference is that people who are sleep deprived because of a busy work schedule usually have no problems sleeping longer on weekends to try to “catch up” on sleep. Someone with insomnia, though, still struggles to sleep despite having the opportunity to do so.

There can be considerable overlap between how sleep deprivation and insomnia are described, but patients should be aware that their doctor or a sleep specialist may use more specific definitions.

What Causes Sleep Deprivation?


Multiple factors can cause or contribute to sleep deprivation including poor sleep hygiene, lifestyle choices, work obligations, sleep disorders, and other medical conditions.

Sleep deprivation is often driven by voluntary choices that reduce available sleep time. For example, a person who decides to stay up late to binge-watch a TV series may experience acute sleep deprivation. An inconsistent sleep schedule may facilitate these decisions and make them feel less intentional in the moment.

Work obligations are another common contributor to sleep deprivation. People who work multiple jobs or extended hours may not have enough time for sufficient sleep. Shift workers who have to work through the night may also find it hard to get the amount of sleep that they really need.

Sleep deficiency may be caused by other sleep disorders or medical conditions. For example, sleep apnea, a breathing disorder that induces dozens of nightly awakenings, may hinder both sleep duration and quality. Other medical or mental health problems, such as pain or general anxiety disorder, can interfere with the quality and quantity of sleep.

What Are the Symptoms of Sleep Deprivation?

The primary signs and symptoms of sleep deprivation include excessive daytime sleepiness and daytime impairment such as reduced concentration, slower thinking, and mood changes.

Feeling extremely tired during the day is one of the hallmark signs of sleep deprivation. People with excessive daytime sleepiness may feel drowsy and have a hard time staying awake even when they need to. In some cases, this results in microsleeps in which a person dozes off for a matter of seconds.

Insufficient sleep can directly affect how a person feels during their waking hours. Examples of these symptoms include:

  • Slowed thinking
  • Reduced attention span
  • Worsened memory
  • Poor or risky decision-making
  • Lack of energy
  • Mood changes including feelings of stress, anxiety, or irritability

A person’s symptoms can depend on the extent of their sleep deprivation and whether it is acute or chronic. Research also suggests that some individuals are more likely to experience symptoms after a lack of sleep and that this may be tied to a person’s genetics. Stimulants like caffeine can also mask the symptoms of sleep deprivation, so it’s important to note how you feel on and off these substances.

What Are the Consequences of Sleep Deprivation?

The effects of sleep deprivation and sleep deficiency can be serious and far-reaching.

Acute sleep deprivation raises the risk of unintentional errors and accidents. Drowsy driving, which involves slowed reaction time and the risk of microsleeps, can be life-threatening. People who are sleep deprived are more likely to struggle in school and work settings or to experience mood changes that may affect personal relationships.

Chronic sleep deprivation can contribute to a wide range of health problems. Sleep plays a fundamental role in the effective functioning of nearly all systems of the body, so a persistent lack of sleep creates significant risks to physical and mental health:

  • Cardiovascular disease: Studies have found strong associations between sleep deficiency and cardiovascular problems including high blood pressure, coronary heart disease, heart attack, and stroke.
  • Diabetes: Insufficient sleep appears to affect the body’s ability to regulate blood sugar, increasing the risk of metabolic conditions like diabetes.
  • Obesity: Research has found that people tend to consume more calories and carbohydrates  when they don’t get enough sleep, which is just one of several ways that poor sleep may be tied to obesity and problems maintaining a healthy weight.
  • Immunodeficiency: Sleep deficiency has been shown to lead to worsened immune function, including a poorer response to vaccines.
  • Hormonal abnormalities: Sleep helps the body properly produce and regulate levels of various hormones, potentially increasing susceptibility to hormonal problems in people with sleep deprivation.
  • Pain: Sleep-deprived people are at a higher risk  of developing pain or feeling that their pain is getting worse. Pain may cause further sleep interruptions, creating a negative cycle of worsening pain and sleep.
  • Mental health disorders: Sleep and mental health are closely intertwined, and poor sleep has strong associations with conditions like depression, anxiety, and bipolar disorder.

Given these diverse and important impacts of sleep deprivation, it comes as no surprise that studies have found insufficient sleep to be tied with a greater overall risk of death as well as a lower quality of life.

On a society-wide level, the impacts of sleep deprivation are enormous. The CDC estimates that as many as 6,000 deaths each year are caused by drowsy driving, and sleep deprivation has been calculated to incur hundreds of billions in added healthcare costs as well as over $400B in productivity losses per year in the United States alone.

 How is Sleep Deprivation Diagnosed?

Doctors can often diagnose sleep deprivation by discussing a patient’s symptoms and sleep patterns. This may involve reviewing a sleep diary or taking a sleep questionnaire that offers a detailed look at sleep patterns and daytime symptoms.

In some cases, additional testing with sleep tracking technology, known as actigraphy, or with an overnight sleep study may be conducted if further information is needed or if a doctor suspects that the patient may have an underlying sleep disorder.

 How To Prevent and Treat Sleep Deprivation

If you have ongoing or worsening problems with insufficient sleep or daytime sleepiness, working with your doctor is a good first step to getting relief. Your doctor can assess your situation and recommend treatment that best suits your needs.

In most cases, a focus on sleep hygiene — your sleep environment and daily habits — is a central component of preventing and treating sleep deprivation. The following sections outline some key sleep hygiene improvements for people who get insufficient sleep.

Address Sleep Deprivation, Don’t Cope With It

Many people get insufficient sleep because they accept sleep deprivation as normal. Rather than take the necessary steps to sleep more, they drink caffeine or energy drinks, nap, or simply try to “power through.”

None of these approaches is a sustainable solution to sleep deprivation. They may help get through the day, but the cumulative effects of sleep deficiency will still take a toll both in the short- and long-term.

For this reason, it is important to refuse to accept a lack of sleep as normal and instead focus on sleeping more and getting higher quality rest.

 Make Sleep a Priority

Chronic insufficient sleep often occurs when people choose to sacrifice sleep in favor of work, leisure, or other obligations. To counteract this, it’s critical to take steps to make sleep a priority:

  • Have a consistent sleep schedule: You should strive to go to bed and wake up at the same times every day. In planning those times, make sure to budget time to get enough sleep. Once you’ve settled on your schedule, follow it closely, even on weekends. Stability in your sleep routine helps avoid fluctuations in your nightly sleep.
  • Set boundaries in your work and social life: It’s easy for the demands of your personal or professional life to chip away at your dedicated time for sleep, so it’s helpful to set boundaries so that you preserve the full time you need for rest each night.
  • Have a bedtime routine: Get yourself ready each night with the same steps such as quietly reading or stretching, putting on pajamas, and brushing your teeth. A steady bedtime routine can put you in the right frame of mind to sleep well each night.

Customize Your Bedroom Environment

Design your bedroom environment to be ideal for your relaxation. You’re less likely to avoid going to bed if your sleep setting is inviting and suits your comfort preferences.

Your mattress and pillows should offer plenty of support, and your bedding should help you feel cozy while maintaining a moderate temperature. To minimize potential sleep disruptions, try to make sure your bedroom is as quiet and dark as possible.

 Avoid Things That Can Interfere With Sleep

A useful step in addressing sleep deprivation is to avoid things that can, often unbeknownst to you, negatively affect your sleep:

  • Electronic devices: TVs, cell phones, tablets, and computers can keep your mind stimulated, leaving you still wired when you want to go to bed. The light emitted by these devices can also interfere with your circadian rhythm. As a result, it’s best to avoid using electronic devices for an hour or more before bed.
  • Alcohol: Drinking, especially at night, can disrupt your normal sleep cycle, reducing overall sleep quality and consistency.
  • Caffeine: As a stimulant, caffeine makes you alert, and because it can stick around in your system for several hours, it’s best to avoid it in the afternoon and evening.
  • Naps: To keep naps from interfering with sleep at night, keep them short (30 minutes or less) and never take them in the late afternoon or later. If you are struggling with insomnia, it’s best to avoid naps altogether.

Make the Most of the Day

Getting frequent sunlight exposure during the day supports a healthy circadian rhythm that helps you be alert during the day and sleepy at night. Regular physical activity can also contribute to a normal sleep schedule, so try to engage in at least moderate exercise every day.

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