Daniel Kripke, the author of the study, said that for people who sleep more than eight hours or eight and a half hours a night, it "may be a good idea" to consider reducing sleep time. But he also cautiously said that more research is needed to prove this point.
Previous studies have shown that long-term sleep deprivation is potentially harmful. For example, a report shows that if a person habitually sleeps less than seven hours a night, the risk of death in a certain period of time is higher than that of people who sleep more.
It can be seen that 6-8 hours of healthy sleep every day is the best!
Recently, foreign medical research has found that many people who often feel tired are not sick or lack of sleep, but are caused by too much sleep! Why does excessive sleep affect mental and physical strength? Because the blood circulation slows down during sleep, the nutrition and oxygen supply of the brain are greatly reduced. Sleep for too long, brain cells can't get enough oxygen and nutrition, so the activity ability is weakened. Too much sleep will reduce the activity of muscles and tendons, and muscles will get less oxygen and nutrition from the blood, so they will become relaxed and naturally feel tired.
Many people who sleep too much and feel tired can speed up their sleep, deepen their sleep and eliminate fatigue and powerlessness if they reduce some sleep time and take appropriate physical exercise.
So sleeping more is not a good thing.
According to the body's biological clock, it is beneficial to sleep at night around 1 1 o'clock, because brain activity and metabolism need to get a full rest between 10 and 2 o'clock.
Too long sleep, like lack of sleep, will lead to mental fatigue, physical fatigue and decreased metabolic rate. Sleep should not be too long. If you sleep too long, your heart will slow down, your metabolic rate will drop to a very low level, and your muscle tissue will relax. Over time, people will become lazy and weak, and even their intelligence will decline. So people should not sleep too long, 7-8 hours of day and night is enough for adults. If you want to gain health by increasing sleep time, it will be counterproductive, increase diseases and shorten life expectancy.