眠ねむり込こむ

godan verb (-mu), intransitive verb

fall asleep; sleep deeply

Describes entering a deep sleep, often unintentionally or while doing something else. The 込む component adds a sense of going fully into the state.

• 本ほんを読よんでいるうちに眠ねむり込こんでしまった。

  I fell asleep while reading a book.

• 疲つかれていたので、すぐに眠