ねい 寝入る Show inflections LinksSentence search for 寝入るSentence search for ねいるKanji details for 寝 and 入Edit in JMdict Godan verb with 'ru' ending, Intransitive verb1. to fall asleepGodan verb with 'ru' ending, Intransitive verb2. to sleep soundlyGodan verb with 'ru' ending, Intransitive verb3. to become dull; to lose vigour; to slacken Discussions Log in to talk about this word.