那么睡多久才算是正常健康的生活习惯呢？根据美国国家睡眠基金会（the National Sleep Foundation）给出的数据，成年人应睡7-9小时；老年人应睡7-8小时。
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Researchers at the University of California, Berkeley conducted two experiments to study the relationship between sleep and willingness to help others.
In the first experiment, they compared the brain images of 24 healthy volunteers after eight hours of sleep and one night without sleep, and found that the areas of the brain associated with empathy were less active during lack of sleep.
In another experiment, they followed more than 100 volunteers for 3-4 days, measured their sleep quality and observed their willingness to help others in their lives.
The results show thatPeople with poor sleep are less likely to choose to help others in their daily interactions.
In addition, after comparing charitable donations in the United States from 2001 to 2016, the researchers found that within a week after the time system was adjusted to daylight saving time, the proportion of people's donations fell by 10%, while adjusting to daylight saving time caused people to lose an hour of sleep.
So how long does it take to sleep as a normal and healthy lifestyle? According to the National Sleep Foundation (the National Sleep Foundation), adults should sleep 7-9 hours; older people should sleep 7-8 hours.
AndThe best sleep length recommended by Chinese authorities is 7-8 hours.So less than 5 hours of sleep is not recommended at any age.
In addition to becoming selfish, lack of sleep can also lead to a variety of physical diseases, such as obesity, so for your own health, please supplement your sleep on time and on time every day.