Miya Pearson
Sleep is a vital part of staying healthy, and a lack of it can have serious consequences on a person's health and well-being. While the amount of sleep needed varies from person to person, it is generally recommended that adults get seven to nine hours of sleep per night. Sleep deprivation can lead to cognitive impairments, mood disturbances, and an increased risk of chronic conditions such as heart disease, obesity, kidney disease, stroke, diabetes, and depression. After 24 hours of no sleep, stress hormones such as cortisol and adrenaline increase, and after 36 hours, symptoms of sleep deprivation worsen, with crankiness, edginess, and zombie-like feelings intensifying. Research suggests that hallucinations are likely after 48 hours without sleep, and as people near 120 hours without sleep, they may experience a rapid and severe decline in mental health, with symptoms of psychosis and detachment from reality. The longest period of time a human being has intentionally gone without sleep is 264 hours (11 days), although it is unclear what happens to the body after 72 hours of no sleep due to a lack of ethical research.
| Characteristics | Values |
|---|---|
| Number of days without sleep | 7 |
| Risk of hallucinations | High |
| Delusions and paranoia | Likely |
| Risk of chronic health conditions | High |
| Impact on hormones | Increased cortisol, decreased insulin |
| Risk of Type 2 Diabetes | High |
| Emotional dysregulation | Likely |
| Increased stress and anxiety | Yes |
| Mood swings | Yes |
| Impaired cognitive function | Yes |
| Perception of reality affected | Yes |
| Risk of self-harm or harm to others | High |
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What You'll Learn
Hallucinations, delusions, and paranoia
Sleep deprivation can have severe consequences for one's health. After 24 hours of no sleep, the body starts pumping the stress hormones cortisol and adrenaline into the bloodstream to help compensate for fatigue and alertness. This can lead to an increase in feelings of anxiety and mood swings. As sleep deprivation continues, it becomes increasingly difficult to stay awake and can impair cognitive function and perception of reality.
Hallucinations are a common occurrence in people who are sleep-deprived. They are more likely to occur after 24 hours of sleeplessness and may compound over time, leading to delusions and paranoia. During sleep deprivation, levels of the neurotransmitter dopamine increase, which is the same chemical messenger that increases during REM sleep, contributing to the vividness of hallucinations. The disruption of dopamine is also accompanied by the disruption of other neurotransmitters that the brain uses to process information and maintain alertness. This can lead to "cross-talk" between parts of the brain that regulate perception and memory, leading to misinterpretations of sensory input and the onset of hallucinations. As the disruption persists, parts of the brain regulating cognition can also become affected, leading to false images and thoughts, known as delusions.
After 72 hours of no sleep, a person will almost certainly experience all three major types of hallucinations: visual, somatic, and auditory. They may also start to experience symptoms consistent with psychosis, including delusions and a total break from reality. In most cases, a day or more of quality, uninterrupted sleep will completely resolve the symptoms without lasting effects. However, in people with underlying mental illnesses, such as schizophrenia or major depression, sleep deprivation can have a cause-and-effect relationship with their condition, complicating symptoms of depersonalization, temporal disorientation, and psychosis.
While the symptoms of short-term sleep deprivation can be resolved by catching up on sleep, chronic poor sleep can put one at an increased risk of serious medical conditions, such as obesity, heart disease, and diabetes.
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Emotional dysregulation and anxiety
Sleep is essential for maintaining optimal brain function, including regulating emotions and behaviours. Sleep deprivation can negatively impact our mental health, making it challenging to manage and process emotions effectively, leading to emotional dysregulation.
When an individual goes without sleep for 24 hours, stress hormones such as cortisol and adrenaline increase significantly. These hormones are released to compensate for fatigue, helping the person stay alert and functional. However, the elevated levels of cortisol can lead to an increased risk of type 2 diabetes due to its impact on insulin release and glucose processing.
The increase in stress hormones also contributes to heightened anxiety and mood swings. After 36 hours without sleep, symptoms such as crankiness, edginess, and zombie-like behaviour typically worsen. The ability to regulate emotions and accurately perceive reality diminishes, leading to a higher risk of hallucinations, delusions, and paranoia.
Chronic sleep deprivation or insomnia can increase the risk of developing mood disorders, including anxiety and depression. People with insomnia are five times more likely to develop depression and a striking 20 times more likely to develop a panic disorder, a type of anxiety disorder. Sleep problems can be both a symptom and a contributing factor to various mental health disorders, including anxiety and depression.
The effects of sleep deprivation are cumulative, and the longer a person goes without sufficient sleep, the more severe the consequences become. While occasional sleep loss may not seem concerning, it can have lingering effects, and when it becomes a habit, it can severely impact overall health and well-being.
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Impaired cognitive function
Sleep is essential for our physical, cognitive, and mental well-being. Sleep deprivation can have severe consequences for our health, and the longer a person goes without sleep, the more intense the side effects become.
After 24 hours without sleep, the body starts producing more cortisol and adrenaline to compensate for fatigue and help the person function. This increase in stress hormones can cause an increase in feelings of anxiety and mood swings. After 36 hours, these symptoms worsen, and the person may become crankier, more on edge, and "zombie-like".
After 72 hours without sleep, a person's ability to regulate their emotions and accurately perceive the world around them is severely compromised. They may start to slur their speech or walk unsteadily. Hallucinations become increasingly likely and complex, and the person may experience blurry or double vision, which can progress into distortions of reality.
After 120 hours without sleep, there is a rapid and severe decline in mental health, with symptoms of psychosis such as complex delusions and violent behaviour.
While there is limited research on the effects of sleep deprivation beyond 120 hours, it is clear that the effects are dramatic and dangerous. Sleep is necessary for repairing cellular damage, and long-term sleep deprivation can lead to cellular degeneration and apoptosis. Sleep deprivation can also lead to serious health problems, including Type 2 diabetes, heart disease, obesity, and depression.
Therefore, it is clear that going without sleep for seven days would have severe and potentially fatal consequences for a person's cognitive function and overall health.
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Increased risk of chronic conditions
Sleep is one of the most basic bodily functions, and it plays a vital role in our physical, cognitive, and mental well-being. While occasional lack of sleep may not seem like a big deal, its impact can be intense and its effects can linger. Chronic sleep deprivation can cause or contribute to a variety of health issues.
Chronic poor sleep puts us at an increased risk of developing serious medical conditions, including obesity, heart disease, kidney disease, and diabetes. During sleep, the body secretes hormones that control appetite, metabolism, and glucose processing. Poor sleep can lead to an increase in the body's production of cortisol, a stress hormone. This, in turn, can lead to an increased risk of type 2 diabetes, as the body may produce less insulin after eating, resulting in too much glucose in the bloodstream.
Sleep deficiency is also linked to a higher chance of injury in adults, teens, and children. For example, sleepiness while driving is responsible for serious car crash injuries and deaths. Sleep deprivation can also lead to "microsleeps," brief moments when a person falls asleep for only a few seconds before waking up. These microsleeps can be incredibly dangerous if they occur while operating heavy machinery or making important decisions.
Additionally, chronic sleep interruption or deprivation can affect hormone balance, leading to emotional dysregulation. As the body pumps out more cortisol, raising the heart rate and blood pressure to keep us alert, the additional stress can increase feelings of anxiety and mood swings. Sleep loss is associated with adverse effects on mood and behavior, with adults reporting excess mental distress, depressive symptoms, anxiety, and alcohol use.
The effects of sleep deprivation compound over time, and the longer a person goes without sleep, the more severe the symptoms become. While the symptoms of short-term sleep deprivation should go away once a person catches up on sleep, chronic sleep deprivation can have long-lasting consequences on overall health and longevity.
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Cellular degeneration
Sleep is a vital restorative process that is essential for our physical, cognitive, and mental well-being. While the short-term effects of sleep deprivation can be reversed by catching up on sleep, chronic sleep deprivation can have severe consequences for our health.
The first stage of sleep deprivation occurs after 24 hours of missed sleep. At this point, the body increases the production of stress hormones such as cortisol and adrenaline to compensate for fatigue and help the person stay awake and function. However, this increase in stress hormones can lead to emotional dysregulation, heightened anxiety, and mood swings.
As sleep deprivation continues beyond 36 hours, symptoms of sleep deprivation worsen. The person may experience blurry or double vision, which can progress into distortions of reality and hallucinations. After about two days without sleep, hallucinations can become increasingly complex and involve multiple senses, making it harder to distinguish them from reality.
By 72 hours without sleep, a person may begin to slur their speech or walk unsteadily. Their ability to regulate emotions and accurately perceive the world around them is severely compromised. As people approach 120 hours without sleep, they are at risk of a rapid and severe decline in mental health, including symptoms of psychosis, complex delusions, and violent behavior.
Long-term sleep deprivation can lead to cellular degeneration and apoptosis. Studies in mice have shown that acute REM sleep deprivation induces lasting neuronal apoptosis, and the apoptosis rate increases on the day following sleep deprivation. While similar studies cannot be performed on humans for ethical reasons, long-term sleep deprivation likely results in cellular damage that aggregates to a tipping point, triggering cellular degeneration.
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Frequently asked questions
It is extremely dangerous to go without sleep for 7 days. There is limited research on the effects of sleep deprivation beyond 72 hours (3 days) as it is difficult to study ethically. However, it is known that after 72 hours without sleep, a person may begin to slur their speech or walk unsteadily. Beyond this point, hallucinations become increasingly frequent and complex. As people approach 120 hours without sleep, they may experience a rapid and severe decline in mental health, including symptoms of psychosis, complex delusions, and violent behaviour.
Sleep deprivation is linked to various adverse health outcomes, including cognitive impairments, mood disturbances, and an increased risk of chronic conditions such as diabetes, kidney disease, stroke, heart disease, and obesity. Sleep is necessary for repairing cellular damage, and long-term sleep deprivation can lead to cellular degeneration and apoptosis.
After 36 hours without sleep, a person may become cranky, on edge, and zombie-like. After 48 hours, hallucinations are likely, and it becomes harder to distinguish them from reality. After 72 hours, a person may begin to experience microsleep, which are brief periods of unintentional sleep that can be dangerous if they occur while driving or operating heavy machinery.
Sleep deprivation can occur due to acute stress, manic episodes, or underlying medical, neurological, psychological, or psychiatric conditions. Sleep apnea, a serious sleep-related breathing disorder, can also cause sleep deprivation.
If you are experiencing sleep deprivation, it is important to seek medical advice. Treatment options may include napping, over-the-counter or prescription sleep aids, cognitive behavioural therapy for insomnia (CBTi), and improving sleep hygiene.
