How can you learn to sleep 4 hours a day without harm to your health? And is it possible?

No, it is impossible to reduce sleep time without losses and health risks. Lack of sleep directly affects how you will feel in the next 40-60 years.

The fact is that important metabolic processes take place during sleep, metabolites (waste products of neurons) are excreted from the brain, which are toxic to the brain if they are retained in cells.

For body and brain health, you need to sleep at least 7.5 hours a day, ideally 9 hours.

Doctors strongly recommend not to save on time for sleep. It is important to remember that it is not just time in bed that counts, but sleep. Therefore, it is important to fall asleep as quickly as possible and sleep comfortably throughout the night. To fall asleep quickly, try:

• Go to bed at the same time.
• Before going to bed, turn off the bright light, turn on the blue filter in the phone.
• Sleep on a comfortable mattress.
• Choose an orthopedic pillow by size, sleeping position and shoulder height.

For 5 months I slept for two hours a day, 20 minutes every four hours. I did not notice any harm to health, only benefits - but I can not help but warn that:
1) The long-term effects of polyphasic sleep have not yet been studied.
2) It is necessary to observe the regime of sports activities, nutrition and diet - be very careful with tea , coffee, cigarettes, alcohol is practically excluded, not overeating at the end or beginning of the cycle (and, for that matter, not overeating at all), training no later than 40 minutes before bedtime, etc. little things.
3) The adaptation process will take from 10 days to a month, depending on personal characteristics.

Most studies have proven that a healthy adult needs 8 hours of sleep daily. There is also a point of view that sleep restores the body as much as possible between 10 pm and 1 am. Surely a question of personal characteristics, but I was convinced by my own example that it works)

My mom constantly tells me that if you sleep at a certain time - from 8 pm to midnight somewhere, you can, oh, how much sleep and feel much better than sleeping 10+ hours o.o

I don't know about the reliability of the information, I haven't tried it myself

If we are talking about doing it all the time, there is no way to avoid harm. Sleep is a very important element of health. 7-8 hours a day, preferably at the same time.

Here is the answer to your question loveread.ec - it all depends on the quality of sleep, and it, in turn, is influenced by your rhythm of life, health status and other factors.