He seemed to be in a deep sleep.
他看上去要深睡过去了。
It is very difficult to awaken a person in deep sleep, and children in this state may be nearly impossible to wake up.
处在深睡眠状态的人极难被唤醒，如果是儿童进入这种状态，唤醒他们几乎是不可能的任务。
Take a few deep breaths, relax, and your body will assume that it's time to sleep and you'll be drooling on your pillow in no time.
做几下深呼吸，然后全身放松，你的身体会认为睡觉的时候到了，于你就能迅速坠入梦乡。
The good news is that it is easy to pay back a sleep debt. Depending on how much in debt you may be, two nights of at least eight hours of deep sleep should get you back into balance.
人人都需要睡眠，但是每个人需要的睡眠时间却各有不同，一般来说八小时就足够了。
The good news is that it is easy to pay back a sleep debt. Depending on how much in debt you may be, two nights of at least eight hours of deep sleep should get you back into balance.
人人都需要睡眠，但是每个人需要的睡眠时间却各有不同，一般来说八小时就足够了。
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