一个睡着的人在大约八小时睡眠时间内整个身子的姿势至少要变化十几次。头、胳膊或腿的活动更为频繁。科学家用一种叫做“脑电流描位器”的仪器对人的睡眠进行了研究。人无论是醒着还是处于睡眠状态,他的大脑不断地发放电波.一个醒着的,松驰状态的人的大脑每秒大约放出十次小电波。 A sleeping person changes posture for at least a dozen times during about eight hours of sleep. Head, arm or leg activities are more frequent. Scientists use a device called a brain current trapper to study human sleep. Whether in a waking or sleeping state, his brain continually sends waves, and a waking, relaxing man’s brain emits about ten small waves every second.