sleep, sleeping
仕事を済ませて数分して、彼は寝についた。
A few minutes after finishing his work, he went to bed.
僕は寝が足りない。
I haven't gotten enough sleep.
寝が足りないので、今日は早めに寝ます。
I didn't get enough sleep, so I'm going to bed early tonight.
私たちは子供にひとり寝の習慣をつけた。
We taught our child to sleep on their own.