Ashwin Lewis
There are several reasons why some people function better with less sleep. One theory is that the body compensates for sleep loss by producing more of the stress hormone cortisol, which can give a false sense of energy. Additionally, some people may have a condition called short sleeper syndrome (SSS), where they naturally need less sleep, typically six or fewer hours, without any known health risks. Other factors, such as genetics, sleep cycles, and external stimulants, can also influence how well individuals function with less sleep. While some people claim to feel more energized with less sleep, sleep scientists warn that adequate sleep is crucial for optimal performance and mental health.
| Characteristics | Values |
|---|---|
| Alertness-boosting hormones | Cortisol and adrenaline |
| Stimulants | Caffeine, energy drinks, sugary snacks |
| Healthy alternatives | Running in the morning sunlight |
| Sleep cycles | REM sleep, deep sleep, light sleep |
| Sleep duration | 4-6 hours |
| Sleep disorders | Short Sleeper Syndrome (SSS) |
| Sleep studies | Sleep apnea |
| Sleep duration | 7-9 hours |
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What You'll Learn
- The body compensates for a lack of sleep with cortisol and adrenaline
- Stimulants like caffeine can mask the effects of sleep deprivation
- Sleep loss can improve mood and reactivity to stimuli
- Short sleeper syndrome allows some people to function on less sleep
- Waking up during light sleep can make you feel more rested
The body compensates for a lack of sleep with cortisol and adrenaline
When you don't get enough sleep, your body produces more of the stress hormone cortisol and the alertness-boosting hormone adrenaline to get you through the day. These hormones give you a false sense of energy and can make it hard to sleep at night, leading to even more sleep loss. This is known as your body's "heroic struggle to compensate for the loss" of sleep.
Cortisol production gets out of whack when you don't get adequate sleep, remaining elevated instead of naturally decreasing. This can provide the illusion that you feel better with less sleep, when in reality, your stress increases, and you lose the ability to have relaxed control. High cortisol levels can cause sleep problems, weight gain, and an increased risk of strokes and heart attacks.
Research shows that pulling an all-nighter significantly increases cortisol levels, but even sleeping for 5.5 hours can increase cortisol levels the next evening. This increase in cortisol can make it difficult to fall asleep at night as you're stuck in fight-or-flight mode, leading to a vicious cycle of sleep loss. Additionally, the body's natural decrease in cortisol levels throughout the day may be impaired, resulting in higher evening cortisol levels and further contributing to sleep difficulties.
While the body's increase in cortisol and adrenaline production can provide a temporary boost in energy and alertness, it is not a sustainable or healthy solution. Sleep serves vital functions that are necessary for maintaining overall health and well-being. Inadequate sleep can lead to dysfunction and eventually illness. It can negatively impact various bodily systems, including the heart and circulatory systems, metabolic systems, immune system, nervous system, and the brain.
It is important to prioritize getting sufficient sleep to maintain optimal health. While you may subjectively feel more energized with less sleep, your performance, health, and well-being are likely to be impacted negatively. Additionally, individual differences in sleep needs should be considered, as some people may naturally require less sleep due to genetic factors or conditions such as short sleep syndrome. However, for most people, the recommended amount of sleep is 7-9 hours per night.
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Stimulants like caffeine can mask the effects of sleep deprivation
When you don't get enough sleep, your body produces more of the alertness-boosting hormones cortisol and adrenaline to get you through the day. This gives you a false sense of energy, and can make it hard to sleep at night, leading to even more sleep loss.
Amphetamines, another stimulant, also promote wakefulness by reducing total sleep time, sleep efficiency, minutes in REM and Stage 3 sleep, and increasing Stage 2 sleep. However, the impact of psychostimulant sleep disruption on cognitive processes has not been thoroughly investigated. One study found that psychostimulants, while preventing sleep, increased working memory and attention. Another study, however, found no benefit of stimulants on cognitive performance for episodic memory and attention 24 hours after drug administration.
Genetics also play a role in individual variability in the metabolism and effects of caffeine. A genome-wide study confirmed the association with a polymorphism in the ADORA2A gene and discovered several genes influencing caffeine-induced insomnia.
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Sleep loss can improve mood and reactivity to stimuli
While it is true that sleep loss can improve mood and reactivity to stimuli, this is only a temporary effect, and the body is merely compensating for the lack of sleep. When an individual does not get enough sleep, the body produces more of the alertness-boosting hormones cortisol and adrenaline, which provide a false sense of energy. This increase in cortisol levels can lead to serious health issues such as weight gain, sleep problems, and an increased risk of strokes and heart attacks. Additionally, while you may feel more energized, your performance, health, and well-being will likely suffer.
Research shows that sleep loss increases reactivity in the brain's reward system. Individuals may react better to both positive and negative stimuli, and may experience improved moods, including giddiness or euphoria. Sleep loss has even been shown to improve depressive symptoms in 40-60% of cases. However, it is important to note that this is not a sustainable solution, as the body cannot continue to produce high levels of cortisol without negative consequences.
The sense of improved mood and reactivity to stimuli due to sleep loss may also be attributed to the individual's sleep cycle. Some people may feel more rested if they wake up at the end of a sleep cycle, regardless of the total number of hours slept. This theory suggests that the stage at which an individual wakes up can impact their subjective feeling of refreshment. However, research on this topic is mixed, and sleep cycles can vary from person to person, making it challenging to draw definitive conclusions.
Additionally, some individuals may have short sleeper syndrome (SSS), a condition where they consistently need less sleep than the average person. People with SSS typically sleep for six or fewer hours each night but wake up feeling energetic and fully rested. This syndrome is believed to be linked to genetic factors, specifically mutations in the DEC2 or ADRB1 gene. However, SSS is relatively rare, and most people require seven to nine hours of sleep to function optimally.
While it may seem counterintuitive, getting enough sleep is crucial for maintaining energy levels and overall health. The body and brain require sleep to restore and repair, and chronic sleep loss can lead to various health issues and a decline in cognitive performance. Therefore, it is essential to prioritize getting sufficient sleep to maintain optimal physical and mental well-being.
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Short sleeper syndrome allows some people to function on less sleep
Short sleeper syndrome (SSS) is a sleep condition where people can function normally on less sleep than the average person. People with SSS typically sleep for six or fewer hours each night and wake up feeling refreshed and energetic. This condition is not a choice or the result of sleep deprivation but is believed to be caused by genetic changes, specifically mutations in the DEC2/BHLHE41, ADRB1, NPSR1, and GRM1 genes. These mutations are often inherited, passed down from parents to their children, and are present from childhood or adolescence onwards.
People with SSS do not experience the negative consequences of sleep deprivation, such as daytime sleepiness or impaired cognitive abilities. They do not need to take naps or sleep more to recover from a lack of sleep, as their bodies naturally require minimal sleep. SSS is not considered a sleep disorder or genetic disorder, and it does not pose any known health risks. In fact, individuals with SSS may be protected against neurodegenerative disorders like dementia, as seen in a study by Ying-Hui Fu.
The occurrence of SSS is rare, with estimates suggesting that only 1 to 3 percent of the population has this trait. Diagnosis can be challenging, and healthcare providers may discuss sleep habits and bedtime routines to understand an individual's sleep patterns better. While SSS allows people to function well on less sleep, adequate sleep is generally crucial for restorative purposes and optimal bodily functions.
While SSS is a valid condition, it is important to note that most people require 7-9 hours of sleep each night. The feeling of functioning better with less sleep may sometimes be attributed to external factors, such as consuming stimulants like caffeine or engaging in activities like morning runs, which boost energy levels. Additionally, the body's production of cortisol and adrenaline can create a false sense of energy when sleep-deprived, but this can lead to serious health consequences over time.
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Waking up during light sleep can make you feel more rested
Sleep is a body process that allows the body to rest, repair, and restore itself. Most human beings need 7 to 9 hours of sleep each night. However, some people might feel more rested with less sleep. This could be because when you don't get enough sleep, your body produces more of the alertness-boosting hormones cortisol and adrenaline to get you through the day. This gives you a false sense of energy, and can make it hard to sleep at night, leading to even more sleep loss.
Additionally, research shows that sleep loss increases reactivity in your brain's reward system. You may react better to both positive and negative stimuli, or you may experience giddiness or euphoria, making you feel better when you sleep less. Sleep loss can even improve the moods of those with depression. Research shows an all-nighter can improve depressive symptoms in 40% to 60% of cases.
The theory that you are sleeping less but waking up at the end of a sleep cycle and feeling better for it is also plausible. Sleep cycles differ for everyone and can change from night to night and throughout the night. Some people might feel more rested after waking up during light sleep. Light sleep is the lightest and shortest stage of NREM sleep, lasting just a few minutes. When you first fall asleep, everything slows down, including your brain waves, heartbeat, breathing, and eye movements. Your muscles start to relax, with the occasional twitch here and there. This stage of sleep is the easiest time to wake a person up.
Smartwatches can detect when you are in light sleep and wake you up then. However, it is important to note that in the long term, sleep disruptions can increase the risk for certain health conditions. For example, researchers have calculated that for each percentage decrease of REM sleep, your risk of dementia increases by 9%.
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Frequently asked questions
You might think you function better with less sleep, but this is likely a false sense of energy. When you don't get enough sleep, your body produces more of the stress hormone cortisol, which can give you a temporary energy boost, but it's not good for your health in the long term.
Not getting enough sleep can have serious consequences for your health. It can increase your risk of high blood pressure, type 2 diabetes, and heart disease, as well as causing a decline in cognitive performance.
Most experts recommend that adults get seven to nine hours of sleep each night. However, it's important to remember that everyone is different, and some people may need more or less sleep than this.
Short sleeper syndrome (SSS) is a condition where people feel fully refreshed after just four to six hours of sleep each night. This is due to genetic changes that affect their sleep needs. People with SSS don't experience any known health risks associated with their reduced sleep.
