Gina Johnson
Sleep is one of our most basic bodily functions, and a lack of it can have serious health consequences. While a few people have managed to go as long as 11 days without sleep, this is not only extremely uncommon but also very dangerous. After just 24 hours without sleep, people can experience impaired coordination, poor memory, and impaired judgment, with symptoms worsening the longer they go without sleep. After two days, people can experience increased irritability, anxiety, foggy memory, and impaired thinking, with some even experiencing hallucinations.
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What You'll Learn
Increased irritability, anxiety, and impaired thinking
Sleep is essential for maintaining good health, and going without it can have significant negative consequences. After two days without sleep, the body enters a state of extreme sleep deprivation. At this point, individuals can expect to experience heightened irritability, anxiety, and impaired thinking.
The body's natural response to 48 hours of sleep deprivation is to initiate microsleeps, which are brief periods of rest lasting between 3 and 15 seconds. During these microsleeps, the brain switches off, and the individual may not be consciously aware of what is happening. These microsleeps can occur without any warning and can be extremely dangerous if they happen during activities that require concentration, such as driving.
In addition to increased irritability and anxiety, individuals may also experience a range of other symptoms, including blurry or double vision, distorted perception of reality, and hallucinations. These hallucinations can become increasingly complex and involve multiple senses, making it difficult to distinguish them from reality. Some people may also experience depersonalization, feeling like they are outside their own body and mind, resulting in a lack of emotion or a careless attitude.
The stress hormones cortisol and adrenaline increase during sleep deprivation to compensate for fatigue and help individuals stay functional. However, these heightened stress hormones can have negative consequences on overall health and well-being. Sleep deprivation can lead to impaired coordination, poor memory, and impaired judgment, similar to the effects of alcohol intoxication.
The longer an individual goes without sleep, the more severe the consequences can be. After 72 hours without sleep, individuals may experience a rapid decline in mental health, including symptoms of psychosis, complex delusions, and even violent behavior. Therefore, it is crucial to prioritize sleep and seek professional help if experiencing difficulty sleeping or if sleep deprivation is impacting your life.
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Hallucinations and distorted reality
Sleep deprivation can lead to hallucinations, which become more intense and frequent the longer one goes without sleep. After 24 hours of sleep deprivation, mild hallucinations may start to occur, such as seeing flashing lights or shadows that aren't really there. After 48 to 72 hours, more intense hallucinations may happen, including seeing detailed images, hearing voices or other sounds that don't exist, or feeling sensations like bugs crawling on the skin. At this stage, the brain is so exhausted that it blurs the line between wakefulness and dreaming.
The type of hallucination experienced depends on which domain of the brain is affected. Visual hallucinations are the most common, followed by somatic (tactile) hallucinations and auditory hallucinations. Less common are olfactory hallucinations, such as smelling something that isn't there, and gustatory hallucinations, such as tasting something strange.
The onset of hallucinations due to sleep deprivation is caused by an increase in dopamine, a neurotransmitter that also increases during REM sleep, contributing to the vividness of hallucinations. This disruption in dopamine is accompanied by disruptions in 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 results in misinterpretations of sensory input and the perception of something that isn't there during wakefulness, creating a compelling state of reality.
As sleep deprivation continues beyond 72 hours, hallucinations may become more complex and intense, and the affected individual may start to experience symptoms consistent with psychosis, including delusions and a total break from reality. Sleep deprivation psychosis is a severe condition where one loses touch with reality and experiences extreme hallucinations and delusions. However, it's important to note that hallucinations and distorted reality due to sleep deprivation can usually be resolved with a period of normal sleep, with most people recovering after one or more nights of quality, uninterrupted rest.
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Extreme fatigue and microsleeps
After 24 hours of sleep deprivation, you may experience extreme fatigue along with other symptoms like mental fog, tremors, irritability, reduced coordination, and increased appetite. Research has shown that people who drove after being awake for 17–19 hours performed worse than those with a blood alcohol level of 0.05%, which is the legal limit for drunk driving in most western European countries and Australia. Another study suggested that performance begins to degrade after 16 hours awake, and 21 hours awake was equivalent to a blood alcohol content of 0.08%, the blood alcohol limit for drunk driving in Canada, the US, and the UK.
As sleep deprivation continues, it becomes increasingly difficult to stay awake, and the symptoms become more severe. After 48 hours without sleep, the body enters a state of extreme sleep deprivation, and it will be even harder to stay awake. Microsleeps become more frequent and longer, and sleep deprivation significantly impairs perception and cognition. Microsleeps are brief periods of sleep that usually last for a few seconds, and they occur when a person is feeling sleepy and trying to stay awake. They can be extremely dangerous if they happen while driving or operating heavy machinery.
The severe symptoms of sleep deprivation include microsleeps, uncontrollable eye movements, trouble speaking clearly, drooping eyelids, hand tremors, hallucinations, and impaired judgment. Hallucinations are a particularly disturbing symptom of sleep deprivation, and they can lead to complex and distressing experiences. Sleep deprivation can also cause emotional distress, increased production of stress hormones, and mood changes, making individuals more impatient or prone to anger.
The longer an individual goes without sleep, the longer it will take to recover. After two days of sleep deprivation, it is recommended to get at least seven hours of sleep to help the body get back on schedule. Napping can be beneficial if only a few hours of sleep have been lost, but it is important to avoid napping too frequently or close to bedtime. In cases of chronic insomnia, cognitive-behavioral therapy (CBTi) is the most effective treatment.
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Increased health risks
Sleep deprivation can have a wide range of adverse effects on the body and mind, and the longer it continues, the more severe these symptoms become. After 24 hours without sleep, a person will feel tired and exhausted, and their risk of errors and accidents in everyday tasks increases. Their coordination, judgment, and memory will be impaired, and they will experience mental fog, tremors, and irritability.
After 48 hours without sleep, the body begins to experience physical symptoms of sleep loss. These can include hallucinations, paranoia, and hostility. The body's hormone balance is affected, leading to emotional dysregulation, and high levels of inflammatory markers in the bloodstream, which can contribute to cardiovascular disease and high blood pressure. Sleep deprivation also affects the endocrine system, increasing cortisol levels, which can cause constant anxiety and stress, triggering inflammation and breaking down collagen fibres in the skin.
The risk of developing chronic conditions also increases with prolonged sleep deprivation. Studies have shown that adults who sleep six hours or less are at a greater risk of developing chronic hypertension and coronary artery disease. Sleep-deprived individuals are also more susceptible to Type 2 diabetes, as their bodies release less insulin after eating, leading to increased glucose in the bloodstream. Sleep deprivation has also been linked to an increased risk of obesity, thyroid disorders, and depression.
In addition to the physical health risks, sleep deprivation can also have a significant impact on mental health. Chronic insomnia has been identified as a possible cause of depression, and even a single night without sleep can lead to depressive and suicidal thoughts. Sleep-deprived individuals may also experience emotional reactivity, decreased attention, impaired hearing, and an increased risk of death from a fatal accident.
The effects of sleep deprivation can be mitigated by practising good sleep hygiene, maintaining a consistent sleep schedule, and seeking medical advice if necessary.
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Impaired coordination and judgement
Sleep is essential for humans, but it remains a mystery to scientists. After just one night without sleep, people experience impaired coordination and judgment, comparable to a person with a blood alcohol level of 0.10%. After 24 hours without sleep, stress hormones like cortisol and adrenaline increase, impairing cognitive function and perception.
At 48 hours without sleep, the body enters a state of extreme sleep deprivation. Microsleeps become more frequent, and the risk of hallucinations increases. These hallucinations can incorporate multiple senses, making them harder to distinguish from reality. Depersonalization may also occur, causing individuals to feel like they are outside their bodies and minds, resulting in a lack of emotion or carelessness.
As people approach 72 hours without sleep, they may experience a decline in physical coordination, slurring their speech or walking unsteadily. Hallucinations become more complex and frequent, further impairing judgment. By this point, the body's urge to sleep may become uncontrollable, and perception of reality may be severely distorted, resembling acute psychosis.
While the effects of sleep deprivation can vary, the accumulation of sleepless nights leads to increasingly strange symptoms. Impaired coordination and judgment are among the initial consequences, but as time without sleep progresses, individuals may experience a range of physical and mental health issues, including increased stress, distorted perception, and a decline in overall functioning.
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Frequently asked questions
After 48 hours without sleep, your body will begin to experience physical symptoms of sleep loss. Your immune system will be impacted, and you may experience visual hallucinations.
Physical symptoms of sleep loss include increased fatigue, impaired coordination, and poor memory and judgment. Your body will also be more prone to illnesses.
Visual hallucinations can manifest as images forming incorrectly on your retinas. These may be benign, such as believing a room is larger than it is, or frightening, like the sudden appearance of an imaginary person or animal.
To cope with two days of sleep loss, it is recommended to get some physical exercise, drink plenty of water, limit your caffeine intake, and consume nutritious meals. Taking regular breaks and naps during the day can also help you stay awake for longer.
Chronic sleep deprivation can have severe impacts on both your mental and physical health. It can increase your risk of cognitive impairment, dementia, type 2 diabetes, obesity, high blood pressure, cardiac events, stroke, and depression.
