| 单词 | 睡眠期 |
| 释义 | 〔sleep〕A natural, periodic state of rest for the mind and body, in which the eyes usually close and consciousness is completely or partially lost, so that there is a decrease in bodily movement and responsiveness to external stimuli. During sleep the brain in human beings and other mammals undergoes a characteristic cycle of brain-wave activity that includes intervals of dreaming.睡眠：意识和身体的自然的、周期性的休息状态，在这种状态中，眼睛通常闭上，意识全部或部分地丧失，身体活动减少，对外界刺激的反应减少。人类和其它哺乳动物在睡眠期内大脑经历一种特有的脑电波活动循环，其中有做梦时的间歇 |
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