他陷入了沉睡。

He fell into ___a ___deep ___sleep.

然后，他陷入了沉睡，把包放在旁边。

Then, he fell into ___a ___deep ___sleep, placing his sack next to him.

长途徒步后，她沉睡不醒，没听到闹钟。

After the long hike, she was in ___a ___deep ___sleep and didn't hear the alarm.