Deep sleep
01
深い眠り, 熟睡
a stage of sleep where the body is fully relaxed, and the mind is less active, making it hard to wake up
例
After a long day of work, he fell into a deep sleep and did n’t wake up until morning.
長い一日の仕事の後、彼は深い眠りに落ち、朝まで目を覚ましませんでした。
