寝ね入いる

godan verb (-ru), intransitive verb

fall asleep

Describes the moment of drifting off to sleep.

• 本ほんを読よんでいるうちに寝ね入いってしまった。

  I fell asleep while reading a book.

godan verb (-ru), intransitive verb

sleep soundly

Implies a deep, peaceful sleep.

• 疲つかれていたので、ぐっすり寝ね入いった。

  I was tired, so I slept soundly.

godan verb (-ru), intransitive verb

become dull; lose vigor; slacken

Rare figurative use; describes a decline in energy or sharpness, often in literary contexts.

• 長なが雨あめで気き持もちが寝ね入いってしまった。

  My spirits became dull from the long rain.