The ducks in the middle sleep deeply with both eyes closed.
中间的鸭子闭着双眼酣睡着。
Doing sports can help you sleep deeply.
做运动可以帮你睡得沉。
This will help them sleep deeply and peacefully.
这将帮助他们睡得很沉，很安详。
But why should they sleep deeply at all?
但是动物为什么要进入深度睡眠呢？
The darker the room, the easier it is to sleep deeply.
房间越漆黑，深度睡眠就越容易。
The heaviness of his heart caused him to sleep deeply.
他心情忧郁，就沉沉入睡了。
The heaviness of his heart caused him to sleep deeply.
他心情忧郁，就沉沉入睡了。
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