He goes to bed as soon as he has class
睡觉───sleep;一───one
REM sleep is termed 'active' sleep.───快速眼动睡眠称作“主动”睡眠。
He slipped unawares into sleep.───他不知不觉地睡着了。
Finally she drifted into sleep.───最后她不知不觉地睡着了。
A lioness lets out a mighty yawn to shake away the sleep and be ready for the wildebeests which were headed in the direction of the pride.───一头母狮打了一个有力的哈欠，它的睡眠被催醒了，准备面对着骄傲地朝着它方向的角马。
To be able to sit by the bed of another, watching him sleep, waiting for nothing else, is to understand where else we might be.───坐在别人的床边，注视着他入眠，别无所求，就可以理解我们可能在的别处。
Stress, mental fatigue and exhaustion can be a result of your work, family life, conflict, or even a lack of good quality sleep.───压力，心力疲惫和精疲力竭可能是由你的工作，家庭生活，冲突，甚至是缺乏良好睡眠引起的。
You'll feel better after a good night's sleep.
Now I shall go to sleep. Good night.
She was just awakening from sleep.
I aroused Kyle from his sleep.
I need to get some sleep.