一いっ睡すい

い

っ

す

い

Freq.FrequencyTop 50,000

Meanings

1

noun, noun or participle which takes 'suru', intransitive verb

a sleep; a nap; a doze

Almost always used in negative or limited contexts, especially 一睡もできない (can't sleep a wink). Rarely used affirmatively.

仮か眠みん
仮眠 is a short nap taken intentionally, while 一睡 is a brief sleep, usually in negative expressions.
昼ひる寝ね
昼寝 is an afternoon nap, while 一睡 is a short sleep at any time, often used in the negative.

Compound of 一 (one) and 睡 (sleep). The exact historical derivation is uncertain, but the meaning is transparent from the kanji.