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1·Sleepwalking happens during deep sleep.

梦游发生在深度睡眠期间。

2·It usually happens in the first few hours of sleep in the period called deep sleep.

它通常发生在睡眠的最初几个小时，这个阶段被称为深度睡眠阶段。

3·During stages three and four (often called deep sleep) , it is very hard to wake up a person.

在第三和第四阶段（通常称为“深度睡眠”），这时唤醒一个人是很难的。

4·This was during the first deep sleep period, the researchers said.

研究人员说，这发生在第一次深度睡眠期间。

5·It was specifically observed that the left side of the brain was more active during deep sleep.

人们特别注意到，在深度睡眠时，左脑更加活跃。

6·During deep sleep, the participants' brains behaved in a similar manner seen in birds and dolphins.

深度睡眠时，参与者的大脑表现与鸟类、海豚相似。

7·When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep.

当研究人员在第二和第三晚重复实验室里的实验时，他们发现在深度睡眠时左脑不能以同样的方式受到刺激。

8·Una soon fell into a deep sleep.

尤纳很快就睡熟了。《柯林斯英汉双解大词典》

9·She sank into a deep sleep.

她沉沉地睡去。《牛津词典》

10·Ros fell into a deep sleep.

罗斯睡着了，睡得很沉。《牛津词典》