疲(つか)れ()て()い()た() tsukareteitaので node眠(ねむ)り()込(こ)ん()で() nemurikondeしまった shimatta。 I was tired and fell sound asleep. Literal Tired [because-ので] fell-asleep [completely-てしまった]. 眠り込んでしまった means 'ended up falling deeply asleep.' 眠り込む is a compound verb: 眠る + 込む (into a deep state). ~てしまった marks unintended completion. sleeptirednesscompound verb~てしまう (regret/completion)
疲(つか)れ()て()い()た() tsukareteitaので node眠(ねむ)り()込(こ)ん()で() nemurikondeしまった shimatta。 I was tired and fell sound asleep. Literal Tired [because-ので] fell-asleep [completely-てしまった]. 眠り込んでしまった means 'ended up falling deeply asleep.' 眠り込む is a compound verb: 眠る + 込む (into a deep state). ~てしまった marks unintended completion. sleeptirednesscompound verb~てしまう (regret/completion)