他陷入了深度睡眠。

He fell into ___a ___deep ___sleep.

然后，他陷入了深度睡眠，把他的袋子放在旁边。

And then, he fell to ___a ___deep ___sleep, putting his sack next to him.

经过疲惫的旅程，孩子整晚都处于深度睡眠中。

After the exhausting journey, the child was in ___a ___deep ___sleep all night.