寝ね忘わすれる

ichidan verb, intransitive verb

oversleep; sleep through (an event)

Used when someone sleeps past an intended time or misses something because they were asleep. Often implies a mistake or unintended result.

• 今朝けさ、目め覚ざましが鳴ならなくて寝ね忘わすれてしまった。

  This morning my alarm didn't go off and I overslept.

• 大だい事じな会かい議ぎに寝ね忘わすれるなんて、信しんじられない。

  I can't believe I slept through such an important meeting.