睡眠不足的危害已众所周知,但英国的一项研究表明,睡眠过量可能会产生类似问题。研究结果显示,睡觉太多对中老年人的危害可能与睡眠不足一样大。一项研究在对近9000人进行调查后发现,对于年龄为50~64岁的人而言,如果每晚睡眠时间少于6小时或多于8小时,记忆力和决策力将会变差。但对于年龄在65~89岁之间的岁数更大的人而言,只有睡眠时间过长才会令其脑力下降。 The dangers of lack of sleep are well known, but a British study shows that excessive sleep may have similar problems. The results show that too much sleep on the elderly may be as much harm as lack of sleep. A survey of nearly 9,000 people found that for people aged 50-64, memory and decision-making power would be worse if they slept less than 6 hours or more per night than night. But for older people between the ages of 65 and 89, their sleep loss will only be diminished if they sleep too long.