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正常人的睡眠呈周期性。每个周期由非快速眼球运动(Non-rapid Eye Movement,NREM)睡眠及其随后的快速眼球运动(Rapid Eye M ovement,REM)睡眠组成。通常每晚有3~5个这样的NREM/REM睡眠周期。正常人REM睡眠期有三个特点:1)低电压混合频率脑电波;2)快速眼球运动;3)低下颏肌电张力。
Normal sleep is cyclical. Each cycle consists of Non-rapid Eye Movement (NREM) sleep followed by Rapid Eye Mood (REM) sleep. Normally there are 3 to 5 such NREM / REM sleep cycles per night. Normal REM sleep has three characteristics: 1) low voltage mixed-frequency brain waves; 2) rapid eye movement; 3) low chin EMG.