Miya Pearson
While it is generally recommended that adults get at least seven to nine hours of sleep per night, some people claim to feel rested after just four hours. This could be due to a variety of factors, including genetic mutations, improved sleep quality, or the practice of polyphasic sleep, which involves multiple sleep sessions over a 24-hour period. However, it is important to note that chronic sleep deprivation can lead to serious health issues and impaired cognitive performance.
| Characteristics | Values |
|---|---|
| Number of hours routinely slept by some | 4 hours |
| Number of hours slept by some on certain nights | 3 hours |
| Number of hours most people need to sleep | 7-9 hours |
| Lower limit of hours for most people | 6 hours |
| Number of hours of sleep for infants (4-12 months old) | 12-16 hours |
| Number of hours of sleep for toddlers (1-2 years old) | 11-14 hours |
| Number of hours of sleep for young children (3-5 years old) | 10-13 hours |
| Number of hours of sleep for school-age children (6-12 years old) | 9-12 hours |
| Number of hours of sleep for "short sleepers" | 4-6 hours |
| Number of gene mutations linked to short sleep | 2 |
| Number of mutations in the DEC2 gene | 1 |
| Number of mutations in the ADRB1 gene | 1 |
| Number of genes with identified mutations | 3 |
| Number of mutations in those genes | 5 |
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What You'll Learn
You may have a gene mutation
The DEC2 mutation is one of the most well-known gene mutations that cause natural short sleep. In 2009, researchers discovered a mother and daughter with a mutation in the DEC2 gene who felt well-rested after around six hours of sleep per night. DEC2 helps regulate circadian rhythms, the natural biological clock that dictates when hormones are released and influences behaviors such as eating and sleeping. The mutation seen in human short sleepers weakens DEC2’s ability to inhibit MyoD1, a gene that turns on orexin production. This leads to more orexin production and causes short sleepers to stay awake longer.
Another mutation that affects sleep is in the ADRB1 gene, which encodes a receptor for the common neural signaling molecule noradrenaline. Researchers found that brain cells with the ADRB1 mutation showed altered activity and were more easily activated. Mice with this mutation slept almost an hour less each day than normal mice, with about seven minutes less of REM sleep and 53 minutes less of non-REM sleep.
Scientists are still working to understand the genetics of natural short sleepers and develop better treatments for sleep disorders. By studying these rare mutations, researchers hope to learn what makes for a good night's sleep and help people get better sleep, leading to happier and healthier lives.
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Improving sleep quality
While some people are able to function well on four hours of sleep or less without facing any health consequences, this is due to a rare genetic mutation. For most people, sleeping less than seven hours per night on a regular basis is associated with adverse health outcomes. Improving your sleep quality can reduce the number of hours you need to spend in bed, but it's important to prioritize getting enough sleep as well as ensuring it's good quality sleep. Here are some tips to improve your sleep quality:
- Practice relaxation techniques before bed. This could include reading a book, taking a hot bath, deep breathing, or visualization.
- Improve your bedroom environment by keeping it at a comfortable temperature and ensuring good air quality.
- Minimize screen time before bed. Blue light from electronic devices can negatively affect your sleep quality by reducing your levels of melatonin, which helps you relax and get deep sleep.
- Get daily sunlight exposure or invest in an artificial bright light device if you don't have access to natural light. Daytime bright light exposure can improve sleep quality and duration.
- Improve your sleep habits by eating dinner earlier in the evening and limiting liquid consumption before bed to avoid excessive urination during the night, which can disrupt your sleep.
- Try drinking tart cherry juice, which may help increase your body's melatonin levels and improve your sleep quality.
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Sleep deprivation consequences
While some people may feel better after four hours of sleep due to a genetic mutation, sleep deprivation can have several negative consequences.
Firstly, sleep deprivation can affect your central nervous system, impairing your body's ability to send and process information. This can lead to difficulties in concentration, learning, and decision-making. It can also cause microsleep, where you fall asleep for a few seconds without realizing it, which can be dangerous if you are driving. Sleep deprivation can also lead to deficits in reaction time and mental vigilance, making it harder to maintain attention or focus.
Secondly, sleep deprivation can negatively impact your emotional state, making it more challenging to regulate your emotions. You may experience irritability, anxiety, and mood changes. It can also lead to emotional distress and increased production of stress hormones.
Additionally, sleep deprivation can affect your physical health. It weakens your immune system, making it harder for your body to fight off illnesses and increasing your vulnerability to respiratory infections and other diseases. Sleep deprivation is also a risk factor for becoming overweight or obese, as it affects the hormones that control feelings of hunger and fullness, leading to increased appetite.
Moreover, sleep deprivation can have serious cardiovascular consequences. It affects the processes that keep your heart and blood vessels healthy, increasing the risk of cardiovascular disease, heart attack, and stroke.
Finally, sleep deprivation can impair your coordination and motor skills, increasing the risk of accidents and falls.
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Sleep duration genetics
While the amount of sleep a person needs varies from person to person, it is generally agreed that somewhere between seven to nine hours is the healthy amount of sleep for an adult. However, some people are able to function well on four hours of sleep or less without facing any health consequences. These people are known as "short sleepers," and it is believed that their ability to function on minimal sleep is caused by a genetic mutation.
In 2009, a team led by neurology professor Ying-Hui Fu of the University of California, San Francisco, discovered that people with a rare mutation in the gene DEC2 were natural short sleepers. Participants in the study with the DEC2 mutation averaged 6.25 hours of sleep per night, compared to 8.06 hours for those without the mutation. This provided the first conclusive evidence that natural short sleep is, at least in some cases, genetic. However, due to the rarity of the DEC2 mutation, it could not explain all cases of natural short sleepers.
Fu's team subsequently studied three generations in one family who were natural short sleepers but did not have the DEC2 mutation. They found that these individuals had a mutation in the gene ADRB1, which was linked to a shorter amount of time spent sleeping. Further experiments in lab-grown cells and mice confirmed that the mutant form of the beta-1 adrenergic receptor, encoded by the ADRB1 gene, degrades more rapidly than the non-mutant version. Optogenetic experiments in mice showed that neurons in the dorsal pons region of the brainstem with the mutated ADRB1 gene were more easily activated and promoted wakefulness.
In addition to these two "short sleep genes," individual sleep needs can vary based on genetics, health, behavior, and environment. For example, people living in hot climates may take afternoon siestas, resulting in shorter sleep durations at night. Age, daily schedules, and other environmental and social factors can also influence sleep patterns and preferences. Genetic factors can also predispose some people to be more susceptible to the adverse side effects of sleep loss, such as deficits in reaction time, mental vigilance, and emotional regulation.
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Sleep health and well-being
Sleep is essential for health and well-being. While individual sleep needs vary according to genetics, health, behaviour, and environment, most adults need seven or more hours of good-quality sleep each night to feel rested and maintain optimal well-being. Routinely sleeping fewer hours than recommended can lead to sleep deprivation, negatively impacting energy levels, productivity, and mental and physical health.
The body's "biological clock" is set according to the pattern of daylight in one's environment, regulating natural sleepiness at night and alertness during the day. However, modern habits, such as screen time and caffeine intake, can interfere with this natural rhythm. To improve sleep health, it is advisable to avoid screens and caffeine close to bedtime and create a consistent sleep schedule with relaxing pre-bed routines.
While some people may feel rested with fewer than seven hours of sleep, this is rare and typically attributed to short sleep syndrome (SSS), caused by a rare gene mutation. People with SSS can function well with four to six hours of sleep without experiencing the negative consequences of sleep deprivation. However, for most people, sleeping only four hours per night will result in deficits in reaction time, mental vigilance, and emotional regulation.
To promote sleep health and well-being, it is crucial to prioritise sleep and create an environment conducive to restful sleep. This may include making lifestyle changes, such as reducing caffeine intake and screen time, as well as adopting healthy habits like regular physical activity and a nutritious diet. Additionally, apps like RISE can help establish personalised sleep hygiene routines to improve sleep quality and duration.
If you consistently struggle to sleep well, it is important to consult a healthcare professional. They can help identify any underlying sleep disorders or conditions that may be impacting your sleep health and provide guidance on improving your sleep habits and overall well-being.
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Frequently asked questions
There is a small chance that you are a "short sleeper", a rare genetic mutation that allows you to function well on 4 hours of sleep or less. However, for most people, 4 hours of sleep is not enough and will lead to adverse health effects.
Sleeping only 4 hours can lead to low energy, poor focus, and irritability. Chronic sleep deprivation can lead to more severe health issues, including heart disease and obesity.
The recommended amount of sleep for adults is between 7 to 9 hours. However, this can vary depending on the individual and factors such as genetics, health, behaviour, and environment.
Improving your sleep quality can help you feel more rested, even if you're sleeping for a shorter duration. Some techniques to improve sleep quality include maintaining a consistent sleep schedule, creating a comfortable sleep environment, and practising relaxation techniques before bed.
