The kanji 睡 primarily conveys the concept of "sleep" or "sleeping." It encompasses the state of being unconscious and resting, typically during the night. It also implies the act of going to bed, or being in a state of rest.

・On-yomi (音読み): suì (スイ) ・Kun-yomi (訓読み): ne-ru (ねる)

⚫︎ 睡眠 (すいみん) Translation: sleep ⚫︎ 睡魔 (すいま) Translation: sleepiness, the Sandman (personification of sleep) ⚫︎ 安眠 (あんみん) Translation: sound sleep

The kanji 睡 is a 形声文字 (keisei moji), a phono-semantic compound. It combines two elements: 目 (me), meaning "eye," and 垂 (sui), which is the phonetic component, suggesting the sound and also implying "hanging down" or "drooping." The combination suggests the visual appearance of the eyes drooping or closing when someone is asleep.