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要保持身体健康,必须保证充足的睡眠。而失眠、过多地熬夜或做梦会导致精力和体力的下降。一个人每天睡眠时间的长短、随年龄、个体和工作情况而不同;一般说来,年轻人约7—9小时,儿童约12～14小时,老人约5—7小时。睡眠与觉醒是生命活动不可缺少的过程。睡眠与身体健康有什么关系呢?近年来,很多科学家通过睡眠过程中的脑电图(记录脑子的活动情况),眼电图(记录眼睛的运动情况)、肌电图(记录颈部肌肉张力程度)的检测,发现睡眠的不同阶段表现不一样。从脑电图的波型来看,分为慢波睡眠和快波睡眠两种时相。成年人入睡开始是慢波,约两小时后进入快波,过半小时又转成慢波,整个睡眠的不同时间里快慢波反复约4—5次,以后快波睡眠时间延长,
To maintain good health, you must ensure adequate sleep. Insomnia, too much to stay up all night or dream will lead to decreased energy and physical strength. The duration of a person’s daily sleep varies depending on the age, individual and working condition; in general, a young person is about 7-9 hours, a child is about 12-14 hours, and an elderly person is about 5-7 hours. Sleep and awakening are indispensable processes of life activity. What is the relationship between sleep and physical health? In recent years, many scientists through the process of sleep EEG (recording the activity of the brain), electromyography (recording eye movements), EMG (neck muscle tone recorded Degree) of the test, found that different stages of sleep performance is not the same. Wave form from the EEG point of view, divided into two phases of slow wave sleep and fast wave sleep. Adults fall asleep slow wave, about two hours later into the fast wave, more than half an hour into a slow wave, the whole time of the different speed of the sleep repeated about 4-5 times, after fast wave sleep time extended,