a natural and periodic state of rest during which consciousness of the world is suspended; "he didn't get enough sleep last night"; "calm as a child in dreamless slumber"休息中に人間の意識が途切れる、自然で周期的な状態睡眠
例:He didn't get enough sleep last night. 夜彼はよく眠れなかった。
be asleep眠っている睡る
a torpid state resembling deep sleep熟睡に似た昏睡状態嗜眠
a period of time spent sleeping; "he felt better after a little sleep"; "there wasn't time for a nap"睡眠に費やす時間睡眠時間