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睡眠是人们十分关心的问题;但人们却很少了解这种无意识的自然状态,也很少了解究竟是什么原因使我们入睡。巳往,研究者研究睡眠是观测脑电波发生了什么变化,并测量睡眠时人体功能的变化。现在他们已把注意力转向“睡眠分子”,即引起无意识状态的化学信号上。几年前法国科学家提出,当脑中释放5-羟色胺(5-HT)时可引起睡眠。三年前美国哈佛医学院从人尿中分离出一种促使慢波睡眠的物
Sleep is a matter of great concern to humans; yet people rarely understand this unconscious natural state, nor do they know exactly what caused us to fall asleep. Researchers have studied sleep to observe what changes have taken place in brain waves and measure changes in human function during sleep. Now they have turned their attention to “sleeping elements,” chemical signals that cause unconsciousness. A few years ago, French scientists proposed that when the brain releases serotonin (5-HT), it can cause sleep. Three years ago Harvard Medical School in the United States isolated from human urine to promote a slow wave of sleep