In young men, "deep sleep" represents 10 to 20 per cent of total sleep.
年轻男子“熟睡”占整个睡眠的百分之十到百分之二十。
Hibernation is more than sleep. It is a deep sleep.
冬眠不是一般的睡眠，而是一种沉睡。
Hibernation is more than sleep. It's a very deep sleep.
冬眠不仅仅是睡觉，而是一种沉睡。
Hibernation is more than sleep. It's a very deep sleep.
冬眠不仅仅是睡觉，而是一种沉睡。
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