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、目覚ましが鳴らなくて寝忘れてしまった。
This morning my alarm didn't go off and I overslept.
大事な会議
I can't believe I slept through such an important meeting.