Evie Summers
Sleep is essential for the brain and body to function at their best, and when a person doesn't get enough sleep, their brain can't repair or build new pathways. While some people can function on less sleep, there appears to be a genetic basis behind this, and for most people, sleep deprivation leads to a decline in cognitive performance. The amount of sleep a person needs varies, but most healthy adults should aim for seven to nine hours each night. It is possible to cut down on sleep, but it is not recommended as it can have negative consequences on health and mental performance. However, improving sleep quality can help reduce the number of hours needed. Additionally, making better use of waking hours and optimizing sleep habits can also help individuals thrive on less sleep.
| Characteristics | Values |
|---|---|
| Number of hours of sleep needed | 7-9 hours for most healthy adults |
| Number of hours of sleep needed for teens | 8-10 hours |
| Number of hours of sleep needed for grade-schoolers | 9-12 hours |
| Number of hours of sleep needed for preschoolers | 10-13 hours |
| Number of hours of sleep needed to avoid a decline in cognitive performance | 8 hours |
| Number of hours of sleep needed to avoid health problems | 7 hours |
| Impact of sleep deprivation | Weight gain, expending less energy, increased calorie intake, increased risk of developing diabetes, depression, cardiovascular disease, hypertension, heart disease, and even death |
| Impact of reducing sleep | Lack of mental focus, increased risk-taking, decline in cognitive performance |
| Impact of reducing sleep | Lack of mental focus, increased risk-taking, decline in cognitive performance |
| Impact of reducing sleep | Lack of mental focus, increased risk-taking, decline in cognitive performance |
| Techniques to improve sleep quality | Exercise in the afternoon, avoid large meals late in the evening, make time to address worries before bed, avoid looking at screens before bed, ensure the bedroom is dark and quiet |
| Techniques to cope with short-term sleep deprivation | Light exercise, spending time in the sunlight, taking short naps, keeping screens out of the bedroom |
| Sleep cycles | Multiple 60- to 90-minute cycles, from slow-wave sleep to REM |
| Sleep masks | Somneo mask, TMS devices |
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What You'll Learn
Sleep deprivation and cognitive performance
Sleep is vital for the brain and body to function at their best. When a person doesn't get enough sleep, their brain can't repair or build new pathways. Sleep deprivation can lead to a decline in cognitive performance, with people taking greater risks and being more likely to make poor decisions.
In one sleep study, participants who cut down their sleep to just six hours a night experienced a decline in cognitive performance and reaction times similar to those who had gone two full nights without sleep. Their bodies didn't adapt to the new sleep schedule, and they were mostly unaware of their poor performance, misjudging how impaired they were. This phenomenon has been compared to intoxication with alcohol, where people also routinely misjudge their level of impairment.
Some people may be able to function on less sleep, and there appears to be a genetic basis for this. However, for most people, the recommended amount of sleep is between seven and nine hours each night for healthy adults. Teens should aim for 8-10 hours, grade-schoolers 9-12 hours, and preschoolers 10-13 hours.
While it may be tempting to try and cut down on sleep to gain more waking hours, this is a flawed approach. Firstly, it is important to treat sleep with the importance it deserves, recognising that it is the foundation of your productivity. Secondly, even if you manage to gain a few extra waking hours, you are unlikely to be able to sustain highly focused work during this time due to fatigue.
If you are consistently getting less than the recommended amount of sleep, you may have settled onto a ""plateau of fatigue", where you stop feeling more tired, but your cognitive performance continues to decline. This means that the true cost of your fatigue is being masked.
While it may not be possible to always get a full eight hours of sleep due to life's demands, there are some strategies you can employ to improve your sleep quality and make the most of the sleep you get. These include:
- Exercising in the afternoon to raise your body temperature and then cool it down by bedtime, helping you fall asleep faster and sleep more deeply.
- Avoiding large meals, heavy exercise, and screen time late in the evening.
- Making time to address any worries before bed so you don't go to sleep stressed.
- Keeping your bedroom dark, quiet, and free of distractions.
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The myth of productivity with less sleep
Sleep is vital for the brain and body to function at their best. When a person doesn't get enough sleep, their brain can't repair or build new pathways. The amount of sleep a person needs varies with age and physical activity, but most healthy adults should aim for seven to nine hours each night. While some people can function on less sleep, there appears to be a genetic basis behind this, and it doesn't work for everyone.
The idea that cutting down on sleep will lead to increased productivity is a myth. While it may seem appealing to have more waking hours to accomplish tasks, the reality is that sleep deprivation erodes the foundation for doing any real work. It impairs cognitive performance and reaction times, and can even lead to health problems such as diabetes, depression, or cardiovascular disease.
Some people may be tempted to make up for sleep deprivation during the week by sleeping longer on the weekends. However, this approach has been found to have negative consequences, including weight gain, reduced energy expenditure, and increased calorie intake. Additionally, trying to “hack” your sleep to spend fewer hours in bed while still feeling rested is generally not effective. While improving sleep quality can reduce the number of hours needed, sleeping for fewer hours than recommended will eventually catch up with you and negatively impact your health and mental performance.
If you're looking to maximise your productivity, it's crucial to treat sleep with the importance it deserves. Make eight hours your default, and focus on optimising your sleep quality by exercising in the afternoon, avoiding large meals late in the evening, and minimising screen time before bed. While it may be tempting to cut down on sleep to gain more hours in the day, the reality is that a well-rested mind and body are the foundation of true productivity.
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Sleep curtailment and cultural resistance
Sleep is influenced and shaped by cultural factors, including cultural values, beliefs, and practices. For instance, studies have shown that parents from Asian countries reported more sleep disturbances in their infants and children than those from Europe, North America, and Australasia. However, no significant difference was found in daytime sleepiness or bedtime resistance between the two groups.
The idea of sleep curtailment has been gaining traction with the development of new technologies, such as the Somneo mask, which is designed to send its wearers into a light sleep faster, and TMS devices, which may be able to launch users straight into deep sleep. These advancements have sparked discussions about the potential cultural resistance to sleep curtailment. While some people may be open to the idea of reducing their sleep time, others may view it as a threat to their cultural beliefs and practices.
The resistance to sleep curtailment is not solely a biological issue but rather a cultural one. The debate surrounding sleep curtailment is closely linked with discussions about human enhancement. An eight-hour consolidated sleep is considered the ultimate cognitive enhancer, and it is difficult to distinguish between sleepiness and a lack of mental focus. Many pharmaceutical cognitive enhancers on the market target both these issues. However, the restorative functions that occur during sleep cannot simply be replicated during waking hours.
The visual system, for example, requires significant energy, and functional MRI studies have shown that different regions of the brain are activated during sleep and wakefulness, indicating that the brain functions differently in these two states. This suggests that sleep plays a unique and crucial role that cannot be easily replaced. While technology may offer solutions to reduce sleep time, the potential strangeness of these innovations may also hinder their widespread acceptance. Furthermore, the potential risks associated with sleep deprivation, such as impaired cognitive performance and increased risk-taking behavior, should not be overlooked.
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Sleep stages and cycles
Sleep is made up of four stages, with each stage serving a unique function. The first stage is the lightest stage of sleep, acting as a transition between wakefulness and sleep. During this stage, it is easy to wake up, and one may experience muscle twitches and a falling sensation.
The second stage is when you are considered properly asleep. Here, your body temperature drops, and heart rate and breathing regulate. You spend most of your night in this stage of sleep.
The third stage is the deepest stage of sleep, also known as slow-wave sleep. During this stage, your muscles are completely relaxed, and your brain consolidates declarative memories from the day. Slow-wave sleep peaks in early childhood and decreases through adulthood, with older people possibly not experiencing it at all.
The fourth stage is REM (rapid-eye movement) sleep, where your brain is most active, and your eyes dart quickly behind closed eyelids. Dreaming occurs during this stage, and brain activity is similar to that during waking hours. REM sleep makes up 25% of your total sleep, with the final REM stage lasting up to an hour.
A typical sleep cycle lasts between 80 to 110 minutes, with four to six cycles per night. You may briefly wake up between cycles. During the first cycle, the REM stage lasts about 10 minutes, with each subsequent REM stage getting longer. In later cycles, the third stage of sleep occurs earlier, and you spend more time in REM sleep.
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Improving sleep quality
While it may be possible to cut down on sleep without repercussions, it is not recommended. Sleep is vital for the brain and body to function at their best, and when a person doesn't get enough sleep, their brain can't repair or build new pathways. Sleep deprivation can impair cognitive performance and reaction times, and people who are sleep-deprived are more likely to take risks.
However, if you are looking to improve your sleep quality, there are several interventions that can help:
- Cognitive behavioral therapy for insomnia (CBT-I) is the gold-standard treatment for sleep problems. It involves making behavioral changes, such as listening to music, establishing sleep rituals, or using sunlight to set your biological clock.
- Avoid naps, as they can interfere with your bedtime routine and make it harder to fall asleep at night.
- Stick to a consistent sleep schedule, even on weekends. Having a regular sleep cycle rhythm will help you feel more rested.
- Refrain from consuming caffeine, nicotine, and alcohol close to bedtime, as these substances can interfere with your sleep.
- Avoid heavy meals before bedtime, as they can disrupt your sleep. Instead, opt for a light snack if you're hungry.
- Establish sleep rituals to signal to your body that it's time to wind down. This can include listening to relaxing music, reading something soothing, drinking caffeine-free tea, or practicing relaxation exercises like deep breathing.
- Make sure your bedroom is quiet, comfortable, and cool. Use earplugs, white noise, or music to block out noise, and consider blackout shades or curtains to block out light.
- Exercise regularly, but avoid strenuous activity close to bedtime, as it may interfere with sleep. Exercising in the afternoon can help raise your body temperature and then cool it down by bedtime, aiding in a more restful sleep.
By implementing these strategies, you can improve your sleep quality, which has been shown to have a positive impact on mental health, including reductions in depression, anxiety, stress, and rumination.
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Frequently asked questions
While it may be possible to cut down on sleep without repercussions, it is not recommended. Sleep is vital for the brain and body to function at their best, and when a person doesn't get enough sleep, their brain can't repair or build new pathways. Lack of sleep can lead to negative effects such as irritability, a weakened immune system, and memory loss. Most healthy adults should aim for between seven and nine hours of sleep each night.
Sleep deprivation can lead to a decline in cognitive performance and reaction times. It can also cause irritability, a weakened immune system, and memory loss. Additionally, people who are sleep-deprived may not be aware of their poor performance and the true cost of their fatigue, as their bodies stop feeling more tired after a certain point.
To optimize sleep, maintain the same sleep and wake times seven days a week, keep the bedroom cool and dark, avoid large meals late in the evening, and minimize screen time before bed. While it may be tempting to cut down on sleep, it is important to prioritize getting enough rest to function at your best.
