Another snooze snack is a warm cup of milk; because milk is rich in the amino acid tryptophan, it can sometimes aid in deep sleep.

另一个会让你犯困的饮料就是一杯温牛奶；因为牛奶富含色氨酸，在一些情况下它有助于你进入深度睡眠。

youdao

A study in Sweden and the United States found that people using a cell phone before bedtime take longer to get into deep sleep and spend less time in the deepest part of sleep.

瑞典和美国研究人员一项最新研究发现，如果睡前使用手机，使用者可能要花更长时间才能进入深度睡眠状态，其深度睡眠时间也会缩短。

youdao

She sat on the stool in front of the wheel and the wheel whirred round. As soon as she touched the spindle she pricked her finger. She fell to the floor in a deep sleep.

她坐在纺车前的凳子上，纺车转起来了，她刚碰到纺锤就刺到了手指，她倒在地板上沉沉的睡去了。

youdao

But think of the various periods during the night in which you are in a deep, deep dreamless sleep.

但请设想你处在这样的夜晚,你处于熟睡，安枕无梦。

耶鲁公开课 - 死亡课程节选

Now I have been teaching this for over seven years because I heard these words over 10 years ago in a yoga class that totally woke me up from a deep sleep of ignorance of what really is.

FORBES: There's Nothing Wrong With You. Really.