ねむる
to sleep
An eye with the lids down, and that is all there is to it. Not getting into bed, which is 寝る, but the eight hours you went numb ねむ for: ねむる.
寝る ねる is lying down to sleep. 眠る is being asleep. 眠い ねむい is sleepy.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.