People sleep three times, and their lives are thinner than paper! The report's sample involved residents aged 18 to 70 in 30 provinces (municipalities and autonomous regions) across China. According to the Report, in 2022, the average length of sleep per night in China is 7.40 hours, with 47.55% of the population sleeping less than 8 hours per night, of which 16.79% sleep less than 7 hours per night on average.

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I. 8 hours is not the standard sleep time, don't be fooled

The "8-hour sleep theory" actually comes from "Capitalism", which was proposed together with the "eight-hour work week". <h1>The 8-hour sleep theory actually comes from "Capitalism", which was proposed together with the "eight-hour work day". The norm in the capitalist countries of the West at the time, as mentioned in "Capitalism", was extremely long working hours, with workers generally working 10-11 hours a day without double days off. The long working hours left workers severely deprived of sleep, and work often resulted in work accidents caused by fatigue.

So the workers rose up in revolt, and it took decades of struggle to get the 9 to 5, double-holiday week that we have today. The slogan at the time was eight hours of sleep, eight hours of work and eight hours of leisure, or 888 work, and that's how 8 hours of sleep was born.

Is there a scientific basis for this "8-hour sleep theory"?

Nick Littleheads, former president of the British Sleep Association, pointed out in his book The Sleep Revolution that everyone has different needs for sleep, so you can't stick to the 8-hour sleep theory. Instead of obsessing about the timing of sleep, the focus should be on the sleep cycle.

A normal sleep cycle is 90 minutes, during which you go through three stages of non-eye movement sleep, eye movement sleep, and rapid eye movement sleep, and as you sleep deeper over time, you go through several sleep cycles each night to help your body rest.

A cohort study published in the JAMA Network Open Subjournal covering more than 320,000 subjects found that the risk of all-cause mortality, risk of cardiovascular disease, and risk of death from other causes was minimized in subjects who slept for 7 hours a day.

Not coincidentally, data from a study involving 500,000 people in the journal Nature also pointed to 7 hours of sleep as the optimal amount of time to promote physical and mental health in middle-aged and older age groups.

So there's no need to obsess about 8 hours of sleep. Whether you get enough sleep depends on your mental state, and if you get 7 hours of sleep and wake up refreshed, you've had enough sleep

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The need for sleep varies by age and cannot be generalized to all age groups.

3. People who sleep three times may have a thinner life than paper

The old saying "people who sleep three times may have a thinner life than paper" is not without merit, as these three types of sleep can affect human health to some extent.

1. Lazy sleep

Generally speaking, 11 pm to 6 am the next day is the golden 7 hours of rest time, occasionally once or twice after this get up does not affect much, but if often seriously beyond the normal wake up time, all belong to the lazy sleep category.

Four universities - the Institute of Medical Science and Technology at Keele University, the University of Leeds, the University of Manchester and the University of East Anglia - did a joint sleep-related study that meta-analysed 74 high-quality studies involving more than 3 million people.

The results found that subjects who slept 10 hours a night had a 30% increased risk of premature death compared to those who slept 8 hours. This included a 56% increased risk of dying from stroke and a 49% increased risk of cardiovascular disease.

2. Sleeping upside down

The human sleep cycle is rhythmic, and people who sleep upside down for long periods of time can develop circadian rhythm disorders. These people may have difficulty falling asleep, increased daytime sleep and difficulty maintaining sleep, and have an increased chance of cardiovascular disease, gastrointestinal disease, metabolic disorders and other problems.

A study in Sleep, a leading journal in the field of sleep, noted that staying up late impairs a variety of human abilities and does not reduce the damage even after catching up on sleep during the day.

A study in the Journal of the American Heart Association, on the other hand, noted that people who took daytime naps for <30 minutes compared to those who slept 7-9 hours at night. People who sleep for <7 hours at night and >30 minutes during the day have a significantly higher risk of developing cardiovascular disease.

3. Sleeping after a meal

After a meal many people will feel very sleepy and will fall asleep in bed before long. The company's main goal is to provide a comprehensive range of products and services to help you achieve your goals. And for the brain blood supply is also unfavorable, easy to have insufficient blood supply to the brain, inducing blood clots. It is recommended to rest for 30 minutes after eating before going to sleep.

4. 4 bad habits to change if you want to improve your sleep

The goodness of sleep is directly related to some details in life, and if you have these habits in you, you are advised to change them as soon as possible.

The light from the screen produced by electronic devices can stimulate your body and reduce the amount of melatonin secreted in your body, which in turn makes it take longer to fall asleep and compromises the quality of sleep. It's easy to lose track of time and take away from normal sleep time when playing with your phone before bed.

Tea and coffee are both refreshing, and drinking them before bedtime can easily excite the brain and interfere with normal sleep. If you like to drink it, do so 4-6 hours before bedtime.

Eating too much food before bed can overload the gastrointestinal tract, which can cause indigestion and bloating, and can stimulate the brain to become excited, making it difficult to fall asleep.

Many people like to make plans for the next day's work and study in bed, but this can easily excite the brain and increase the chance of insomnia. You should think of nothing before going to bed, listen to soothing music, and let your brain fully relax.

In life, we don't have to be too obsessed with getting 8 hours of sleep, but more with physical feedback. Waking up feeling relaxed and not feeling any fatigue means the right amount of sleep.