Ashwin Lewis
Sleep is essential for our physical and mental health. Even a single night of missed sleep can have adverse effects on the body, causing daytime sleepiness, anxiety, irritability, and impaired cognitive abilities. As the hours of missed sleep accumulate, so do the health consequences. After 48 hours of sleep deprivation, the body involuntarily shuts down for 'microsleeps', which can be dangerous if they occur at the wrong time. At 72 hours, individuals may experience hallucinations, delusions, paranoia, and a loss of touch with reality. While some people have managed to stay awake for 10 days or more, it is extremely dangerous and can result in serious physical and mental health issues.
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What You'll Learn
Hallucinations and paranoia
Sleep deprivation can lead to hallucinations, and the longer one goes without sleep, the more likely and severe they become. After 24 hours without sleep, one is more likely to experience hallucinations, and after 72 hours, a person will almost certainly experience visual, somatic, and auditory hallucinations.
The types of hallucinations vary depending on which domain of the brain is affected. Visual hallucinations are the most common, with individuals seeing flashing lights, geometric patterns, animals, or faces. Somatic hallucinations are the second most common, with individuals feeling bugs on their skin or distortions of their body. Auditory hallucinations are the third most common, with individuals hearing voices, music, animal sounds, or environmental noises. Olfactory hallucinations involve smelling food, flowers, garbage, or something burning, while gustatory hallucinations involve tasting metal or an overwhelmingly rotten taste.
During sleep deprivation, levels of the neurotransmitter dopamine increase, which contributes to the vividness of hallucinations. The disruption of dopamine is accompanied by the disruption of other neurotransmitters that the brain uses to process information and maintain alertness, leading to "cross-talk" between parts of the brain that regulate perception and memory. This, in turn, leads to misinterpretations of sensory input and the onset of hallucinations. As the disruption persists and worsens, parts of the brain regulating cognition can also become affected, leading not only to false images but also to false thoughts known as delusions.
In addition to hallucinations, paranoia is another symptom of sleep deprivation. Sleep dysfunction commonly co-occurs with paranoia, and there is evidence of a bidirectional causal relationship between the two. Sleep disruption can lead to increased paranoia, and negative affect frequently mediates this relationship.
While the symptoms of short-term sleep deprivation can be resolved after a period of normal sleep, it is important to note that sleep deprivation can have severe consequences on one's physical, cognitive, and mental well-being. Extreme sleep deprivation can be dangerous, and in some cases, it may be necessary to seek help from a mental health professional.
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Cognitive impairment
Sleep is a vital and organized sequence of events that follows a regular cyclic program each night to ensure the human body can perform at its optimum. Sleep deprivation can induce adverse changes in cognitive performance.
After 24 hours of no sleep, stress hormones like cortisol and adrenaline increase to compensate for fatigue and help you function. The consequences of sleep deprivation at 24 hours are comparable to the cognitive impairment of someone with a blood alcohol content of 0.1%. You may experience reduced reaction time, slurred speech, and slowed thinking.
After 48 hours of no sleep, the body copes by shutting down for involuntary episodes of sleep called microsleeps. These can be dangerous if they occur at the wrong time.
After 72 hours of no sleep, your perception of reality may be severely distorted, resembling acute psychosis. You may experience significant deficits in concentration, motivation, and perception, as well as hallucinations, delusions, and paranoia.
Sleep deprivation can also affect long-term cognition. Studies have found that people who are sleep-deprived are at risk of forming false memories. Sleep helps the brain conduct important housekeeping, such as clearing out potentially dangerous beta amyloid proteins, which are a primary reason for many neurodegenerative diseases such as dementia and Alzheimer's disease. Sleep deprivation can also affect specific cognitive systems, such as those that rely on emotional data.
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Increased risk of illness
While staying awake for 10 days is almost impossible, even missing sleep for 48 hours is considered extreme sleep deprivation. At this point, the body starts to shut down for involuntary episodes of sleep called microsleeps, which can be dangerous if they occur at the wrong time. After 72 hours, an individual's perception of reality may be severely distorted, resembling acute psychosis.
Sleep deprivation has been linked to an increased risk of developing certain conditions or worsening existing ones. These include:
- Type 2 diabetes: Sleep deprivation lowers the body's tolerance for glucose and is associated with insulin resistance.
- High blood pressure (hypertension): Sleep deprivation affects the body's ability to regulate blood pressure, which can increase the risk of hypertension.
- Obstructive sleep apnea: Menopause, for example, increases the risk of OSA, possibly due to lower levels of progestational hormones that influence the respiratory system.
- Vascular disease: Sleep deprivation affects processes that keep the heart and blood vessels healthy, including blood sugar, blood pressure, and inflammation levels.
- Heart attack: Sleep deprivation can increase the risk of heart attack, and one analysis linked insomnia to a higher risk of heart attack and stroke.
- Depression: Sleep deprivation negatively affects mental health, making it harder to manage and process emotions.
- Conditions that involve psychosis: Sleep deprivation can cause hallucinations, delusions, and paranoia.
In addition to these specific conditions, sleep deprivation has been associated with increased age-specific mortality. One large American study found that sleeping five hours or less increased the risk of death from all causes by roughly 15%. Sleep deprivation can also delay recovery from other conditions or make them worse, so it's important to address it with the help of a healthcare provider.
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Emotional dysregulation
Sleep is critical to maintaining physical and mental health. Sleep deprivation can have a significant impact on emotional regulation, leading to increased negative emotional responses and decreased positive emotions.
When an individual goes without sleep for 10 days, they will likely experience severe emotional dysregulation. This can manifest as heightened anxiety, irritability, and mood swings. The stress hormones cortisol and adrenaline increase after 24 hours of sleep deprivation, leading to increased heart rate and blood pressure as the body attempts to stay alert. This, in turn, can intensify feelings of anxiety and crankiness.
After 48 hours of sleep deprivation, the body begins to experience extreme sleep deprivation, and the urge to sleep becomes overwhelming. Microsleeps, or involuntary episodes of sleep lasting 3 to 15 seconds, start to occur as the body's way of compensating for the lack of sleep. These microsleeps can be dangerous if they happen at the wrong time.
By 72 hours of sleep deprivation, individuals may experience hallucinations, delusions, and paranoia, in addition to significant deficits in concentration and motivation. Their perception of reality may become severely distorted, resembling acute psychosis. Emotional dysregulation is further exacerbated at this stage, with individuals struggling to regulate their emotions and accurately perceive the world around them.
The impact of sleep deprivation on emotional regulation is bidirectional. Emotional events during waking hours can affect sleep quality and duration, influencing dream patterns and content. Sleep, in turn, plays a crucial role in processing and regulating emotions, impacting how individuals react to emotional events in their daily lives.
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Microsleeps
The danger associated with microsleeps arises when they occur in situations requiring constant alertness. Driving a vehicle or operating heavy machinery while experiencing microsleep can be extremely hazardous, as reaction times are impaired. Drowsy driving has led to numerous accidents and even fatalities. In fact, up to 6,000 fatal crashes each year in the United States may be linked to drowsy drivers, highlighting the serious public safety implications of microsleeps.
The signs of microsleep can vary between individuals but often include droopy eyes, slow eyelid closure, and head nodding. Brain waves measured by electroencephalography (EEG) show noticeable slowing during microsleep episodes, with theta waves (4-7 Hz) replacing the faster alpha waves (8-13 Hz) typical of a wakeful state. While microsleeps themselves are not dangerous, they can lead to incidents if they occur in risky environments. Therefore, it is crucial to address sleep deprivation and improve sleep habits to minimise the occurrence of microsleeps, especially in situations where they pose a safety risk.
To reduce the occurrence of microsleeps, it is important to prioritise sleep hygiene and maintain a consistent sleep schedule. Adults are generally recommended to get 7-9 hours of sleep per night. Short-term strategies, such as taking a power nap, having a caffeinated beverage, or engaging in conversation, can also help combat drowsiness. However, for those with persistent sleep issues, seeking professional help and considering treatments like cognitive behavioural therapy for insomnia (CBTi) may be necessary.
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Frequently asked questions
It is extremely dangerous to go without sleep for 10 days, and it could result in serious physical and mental health consequences.
After 24 hours without sleep, you will feel tired, exhausted, and "off". Your risk of errors and accidents in everyday tasks increases, and you may experience reduced reaction time, slurred speech, and slowed thinking. You may also feel more irritable and anxious.
After 48 hours, extreme sleep deprivation sets in, and the body copes by entering microsleep, which are involuntary episodes of sleep that can last between 3 to 15 seconds.
After 3 days without sleep, your perception of reality may be severely distorted, resembling acute psychosis. You may also experience hallucinations, delusions, and paranoia. Your ability to regulate your emotions will be severely compromised, and you will struggle with executive functioning and thinking.
Chronic sleep deprivation increases your risk of many conditions, including cognitive decline, memory impairment, weakened immune system, impaired motor coordination and vision, increased risk of accidents and injuries, depression, anxiety, and decreased libido.
