Evie Summers
Sleep is essential for our health and well-being, but can some people function normally with less sleep than recommended? The answer may lie in a rare genetic mutation. Short Sleeper Syndrome (SSS) is a condition where people consistently sleep for fewer than six hours each night and can function normally without feeling the need for naps or extra sleep on weekends. This is distinct from those who choose to limit their sleep. While most adults require seven to nine hours of sleep, those with SSS can perform well at work or school despite their short sleep duration. Research suggests that SSS may be linked to a specific gene mutation, with studies showing that individuals carrying this mutation outperformed their identical twins who lacked it. However, it's important to note that sleep deprivation can have negative consequences, including impaired performance and an increased risk of accidents.
| Characteristics | Values |
|---|---|
| People with Short Sleep Syndrome (SSS) can function normally with | Less than six hours of sleep per night |
| People with SSS feel the need to | No naps or extra sleep on weekends |
| SSS is caused by | A rare gene mutation |
| SSS affects | 1 in 50,000 people |
| SSS usually begins in | Childhood or adolescence |
| People without SSS who sleep less than recommended may experience | Carbohydrate cravings, less interest in sex, trouble concentrating |
| Sleep deprivation can lead to | Chronic diseases like CAD, CHF, COPD, CKD, Parkinson's disease |
| Sleep deprivation can be caused by | Stress, caffeine, poor sleep environment, sleep disorders |
| Sleep deprivation can be combated with | Sleep hygiene, light therapy, resetting sleep schedule |
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What You'll Learn
Short sleep syndrome (SSS)
The pattern of short sleep usually begins in childhood or adolescence and continues into adulthood. It is believed to be caused by a rare gene mutation, specifically a variation of the ADRB1 gene, which is associated with shortened sleep cycles and higher levels of β1-adrenergic receptors. These receptors regulate body functions during the sleep-wake cycle. The circadian rhythm is largely synchronised to day and night, but in people with the ADRB1 mutation, this cycle is "reprogrammed" so that the biological and hormonal changes the body needs to undergo during sleep to function normally are performed within a shorter period.
People with SSS do not experience the same health risks as those who do not get enough sleep. Their sleep quality tends to be good, which helps lower their risk of cardiovascular disease and heart attacks. There are no known health problems related to SSS, and it is not considered a sleep disorder. However, if you are experiencing any sleep problems, it is important to schedule an appointment with your doctor.
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Sleep deprivation
The effects of sleep deprivation can vary from person to person, but generally, it can cause a decline in cognitive functioning, higher susceptibility to infections and injury, and slower healing from illness and injury. Sleep deprivation can also worsen chronic illnesses and contribute to slower recovery from exercise. For children and teenagers, insufficient sleep may lead to slower growth.
There are several causes of sleep deprivation, including sleep disorders such as insomnia, narcolepsy, sleep apnea, and restless leg syndrome. Other factors that can contribute to sleep deprivation include consuming too much caffeine or alcohol, irregular sleep schedules, and electronic device usage before bedtime.
It is important to note that some people naturally require less sleep due to a condition known as Short Sleeper Syndrome (SSS) or Short Sleep Syndrome. Individuals with SSS can function normally with fewer than six hours of sleep per night and do not experience the negative effects typically associated with sleep deprivation. SSS is believed to be caused by a rare gene mutation that affects the body's circadian rhythm, allowing individuals to function optimally with shorter sleep cycles.
To improve sleep quality and duration, it is recommended to maintain good sleep hygiene. This includes practices such as keeping a consistent sleep schedule, engaging in relaxing activities before bedtime, maintaining a cool and dark bedroom environment, and avoiding stimulants like caffeine and alcohol close to bedtime.
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Sleep disorders
Intrinsic Sleep Disorders:
- Insomnia: Difficulty falling or staying asleep, which may be temporary or persistent.
- Narcolepsy: A condition characterized by excessive daytime sleepiness and sudden attacks of sleep.
- Obstructive Sleep Apnea: A breathing disorder that interrupts sleep and reduces sleep quality.
- Central Sleep Apnea: A sleep disorder where breathing stops temporarily during sleep.
- Restless Leg Syndrome: An overwhelming urge to move the legs, often accompanied by uncomfortable sensations.
Extrinsic Sleep Disorders:
- Food Allergy Insomnia: Sleep disruption caused by allergic reactions to certain foods.
- Alcohol-Induced Insomnia: Sleep disturbances due to alcohol consumption, which can affect sleep onset and quality.
- Poor Sleep Hygiene: Habits and environmental factors that negatively impact sleep, such as excessive caffeine intake, bright or loud bedrooms, irregular sleep schedules, and the use of electronics before bed.
Additionally, there are people who suffer from a rare condition called Short Sleeper Syndrome (SSS). These individuals require less than six hours of sleep per night and can function normally without experiencing the negative effects of sleep deprivation. SSS is believed to be caused by a specific gene mutation that affects sleep/wake cycles and is often inherited. However, it is important to distinguish SSS from sleep disorders, as those with SSS do not exhibit signs of sleep deprivation and do not require treatment.
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Sleep hygiene
Optimise your sleep schedule
- Maintain a fixed wake-up time: Keep the same wake-up time every day, including weekends, to establish a consistent sleep rhythm.
- Prioritise sleep: Avoid sacrificing sleep for other activities. Calculate your target bedtime based on your wake-up time and stick to it as much as possible.
- Make gradual adjustments: If you need to shift your sleep times, do so gradually in small steps to avoid disrupting your sleep schedule.
- Limit naps: Naps can disrupt nighttime sleep. Keep them short (30 minutes or less) and in the early afternoon.
Establish a nightly routine
- Keep your routine consistent: Follow the same pre-sleep steps each night to reinforce the bedtime signal to your mind and body.
- Wind down before bedtime: Allocate 30 minutes for calming activities like soft music, light stretching, reading, or relaxation exercises.
- Avoid bright lights: Bright lights hinder melatonin production, so dim the lights before bedtime.
- Unplug from electronics: Take a break from devices like phones, tablets, and laptops 30-60 minutes before bed to reduce mental stimulation and blue light exposure, which can disrupt sleep.
- Practice relaxation techniques: Focus on relaxation rather than sleep. Try meditation, mindfulness, paced breathing, or other relaxation methods to prepare your mind for sleep.
- Avoid tossing and turning: If you can't fall asleep within 20 minutes, get up and engage in a calming activity in low light before trying again.
Cultivate healthy daily habits
- Get daylight exposure: Sunlight is a key driver of circadian rhythms, which promote quality sleep.
- Exercise regularly: Regular physical activity improves sleep quality and offers other health benefits.
- Avoid smoking: Nicotine stimulates the body in ways that disrupt sleep.
- Reduce alcohol consumption: Alcohol may help you fall asleep initially but can disrupt sleep later in the night. Moderate your intake and avoid drinking close to bedtime.
- Limit caffeine intake: Caffeine is a stimulant that can keep you wired when you want to rest. Avoid consuming it in the afternoon and evening.
- Eat dinner early: Late or heavy meals close to bedtime can disrupt sleep due to digestion. Keep any pre-bed snacks light.
- Restrict in-bed activities: Associate your bed primarily with sleep to strengthen the mental connection.
Optimise your bedroom environment
- Comfortable mattress and pillow: Choose a sleeping surface that provides comfort and supports pain-free sleep.
- High-quality bedding: Ensure your sheets and blankets meet your needs and preferences for a pleasant sleep experience.
- Maintain a cool temperature: Keep your bedroom on the cooler side, around 65°F (18.3°C).
- Block out light: Use heavy curtains or an eye mask to prevent light from interrupting your sleep.
- Reduce noise: Use earplugs, a white noise machine, or a fan to minimise noise disturbances.
- Try calming scents: Light scents like lavender may promote relaxation and create a positive sleep environment.
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Sleep stages
Sleep is not uniform. Instead, it is made up of several rounds of the sleep cycle, which is composed of four individual stages. In a typical night, a person goes through four to six sleep cycles, with each cycle lasting around 90 minutes. The first sleep cycle is often the shortest, ranging from 70 to 100 minutes, while later cycles tend to be longer, ranging from 90 to 120 minutes.
The four sleep stages are rapid eye movement (REM) sleep and three non-rapid eye movement (NREM) sleep stages. These stages are determined by analysing brain activity during sleep, which shows distinct patterns for each stage.
Stage 1 (N1)
Stage 1, or N1, is the lightest stage of sleep and usually lasts just one to seven minutes, making up about 5% of total sleep time. This is when a person first falls asleep, and the body and brain activities start to slow, with periods of brief movements. It is easy to wake someone up during this stage, but if undisturbed, they will quickly move into stage 2.
Stage 2 (N2)
During stage 2, or N2, the body enters a more subdued state, with a drop in temperature, relaxed muscles, and slowed breathing and heart rate. Brain waves show a new pattern, and eye movement stops. Brain activity slows, but there are short bursts of activity that help resist being woken up by external stimuli. Stage 2 can last for 10 to 25 minutes during the first sleep cycle, and each N2 stage can become longer during the night. Overall, a person typically spends about half their sleep time in N2 sleep.
Stage 3 (N3)
Stage 3, or N3, is also known as deep sleep, and it is harder to wake someone up during this phase. Muscle tone, pulse, and breathing rate decrease further as the body relaxes. The brain activity during this stage has a distinct pattern of delta waves, so it is also called delta sleep or slow-wave sleep (SWS). This stage is critical for restorative sleep, allowing for bodily recovery, growth, and a boost to the immune system. It also contributes to insightful thinking, creativity, and memory. N3 sleep makes up about 25% of total sleep time in adults, but the older we get, the less time we spend in this stage.
REM Sleep
REM sleep is associated with dreaming and is believed to be essential for cognitive functions like memory, learning, and creativity. While the body is temporarily paralysed during REM sleep, the eyes and the muscles that control breathing remain active, and the eyes can be seen moving quickly behind closed eyelids. REM sleep usually starts about 90 minutes after falling asleep, and each cycle gets longer as the night goes on, with the final cycle lasting up to an hour.
Sleep Cycles
The sleep stages progress in the following order: N1, N2, N3, N2, REM. After the first REM cycle, a new sleep cycle begins, starting again with stage 1 or 2.
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Frequently asked questions
The National Sleep Foundation recommends that adults get 7-9 hours of sleep per night. However, this can vary depending on age, daily activities, and overall health.
Not getting enough sleep can lead to sleep deprivation, which can cause symptoms such as drowsiness, forgetfulness, and moodiness as well as lower cognitive functioning. Chronic sleep deprivation has also been linked to an increased risk of developing cardiovascular disease, hypertension, obesity, type 2 diabetes, and some forms of cancer.
Yes, some people have a rare condition called Short Sleeper Syndrome (SSS) or Short Sleep Syndrome, which is caused by a gene mutation. People with SSS can function normally with less than six hours of sleep per night and do not experience the negative effects of sleep deprivation.
