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有的科学家根据睡眠者的脑电图,測出大脑皮层細胞的抑制程度,即入睡的深淺程度,从而把睡眠分成四期。剛剛入睡时是第一期,然后逐渐加深,进入第二、三期,直到第四期,以后又回到第一期。整个夜晚,各期循环重复,作周期性变化。每个完整的周期大約要有90分钟,故一个人睡觉8小时,一般說約有5—6个周期出現。梦是睡眠中一部分脑細胞活动的結果。試驗表明,只有在睡得最不熟的第一期才可能作梦。在睡眠者的脑电图具有第一期待征时将他叫醒,54次中有46次他觉得是把梦打断了。而在別的
According to the sleeper’s electroencephalogram, some scientists measured the degree of inhibition of the cerebral cortex cells, that is, the depth of sleep, which divided the sleep into four phases. When I first fell asleep, it was the first period, and then gradually deepened into the second and third period until the fourth period, and then returned to the first period. Throughout the night, cycles are repeated for periodic changes. Each complete cycle takes approximately 90 minutes, so a person sleeps for 8 hours, generally about 5-6 cycles appear. Dreams are the result of a part of brain cell activity in sleep. Tests have shown that it is possible to dream only in the first phase of sleeplessness. He was awakened when the sleeper’s EEG had the first expectation. 46 of 54 times he felt that he had interrupted the dream. And in other