ねむらせっちゃう
nemurasecchau

Ichidan Verb
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 眠らせる

1. To let [someone/something] sleep; To put [someone/something] to sleep (accidentally/unintentionally); To fall asleep (on someone/something)

Completed Action
Colloquial