人们常以为,睡眠时间随着人的年龄增长而逐渐缩短。所以,有‘前三十年睡不醒,后三十年睡不着’之说。但最新研究结果表明,老年人由于生理机能减退,疲劳后恢复较慢,不宜少睡。失眠是老年人常出现的症状,有时会造成很大痛苦。一个人如果持续60小时不眠,就可能出现精神异常。所以长期失眠会给人的健康带来很大的危害。一个健康人的睡眠由4—6个周期组成,在每个周期中又分慢波睡眠 People often think that, sleep time as people age and gradually shorten. So, there is ’no sleep before thirty years, after thirty years can not sleep,’ said. However, the latest findings show that the elderly due to decreased physiological function, recovery after fatigue slow, should not sleep less. Insomnia is a common symptom of the elderly, sometimes causing great pain. If a person does not sleep lasting 60 hours, mental disorders may occur. So long-term insomnia will bring great harm to human health. A healthy person’s sleep consists of 4-6 cycles, in each cycle is divided into slow-wave sleep