godan verb (-mu), intransitive verb
fall fast asleep; sleep deeply
Describes falling into a deep, sound sleep, often unintentionally or when one should be awake.
疲れていたので、ソファで寝込んでしまった。
I was so tired that I fell fast asleep on the sofa.
godan verb (-mu), intransitive verb
be laid up; be confined to bed
Used when someone is ill or injured and must stay in bed for a period of time.
風邪で一週間寝込んでいた。
I was laid up with a cold for a week.