How many hours of deep sleep is good every day

Modern scientific research shows that people cannot live without sleep. Through observations with sleep monitors, scientists divide sleep into two parts: one part is called rapid eye movement sleep (REM); the other part is called non-rapid eye movement sleep (UREM). The sleep of a normal person shows the following regular distribution: it starts with UREM, from light to deep, after 60 to 90 minutes, it becomes REM, and after 10 to 15 minutes, it becomes UREM again, and it alternates like this, about 4 to 6 times a night, until you wake up in the morning! Here, what we want to say is, how many hours of deep sleep a day is good?

1. Deep sleep only accounts for 25% of sleep time

Based on the changes in brain waves, muscle waves and eye activities during sleep, the sleep cycle consists of non-rapid eye movement cycles and rapid eye movement cycles. Non-rapid eye movement sleep is divided into four stages: light sleep, light sleep, moderate sleep and deep sleep. Then it enters the rapid eye movement sleep stage. This marks the end of a sleep cycle and the next sleep cycle begins.

People's nighttime sleep is generally divided into 5 to 6 cycles that repeat themselves, and each sleep cycle lasts about 60 to 90 minutes.

The first two stages of a normal sleep cycle are light sleep stages, accounting for about 50% of the total sleep time. The last two stages are deep sleep stages, accounting for about 25% of the total sleep time. The remaining 25% is rapid eye movement sleep time.

2. Deep sleep ensures quality sleep

Studies have shown that light sleep and light sleep, which account for about 55% of the total sleep time, have little effect on relieving fatigue. Only the middle sleep, deep sleep and rapid eye movement sleep that enter the deep sleep state have a greater effect on relieving fatigue. It can be seen that sleep quality is mainly related to deep sleep time. Improving deep sleep time can ensure sleep quality.

In addition, it is important to understand that deep sleep is beneficial to the recovery of various physiological indicators of the human body, but as we age, the time of deep sleep becomes shorter and shorter. After we are over 80 years old, deep sleep may even disappear, thus affecting the physiological and psychological recovery of the human body.

3. How to enter deep sleep

Deep sleep is a part of sleep that only accounts for 25% of total sleep time. Deep sleep can relieve physical fatigue and make people feel refreshed, but not everyone's sleep cycle can reach the deep sleep stage. Therefore, if you want to sleep well, you must ensure deep sleep and prolong the time of deep sleep.

1. Drink lily and jujube seed tea before going to bed to calm the mind and help sleep, shorten the time to fall asleep, and ensure deep sleep. The elderly and those who are under great stress are particularly in need;

2. Ensure that the sleep time is about 8 hours, increase the sleep cycle, and extend the deep sleep time;

3. To create a good sleeping environment, comfortable pillows, mattresses and quilts are essential;

4. Take a bath one hour before going to bed, listen to music, relieve physical stress and relax your mind;

5. Develop good sleeping habits, do not play with mobile phones, play games, or watch videos in bed.