To Oversleep
する verb
寝坊 is oversleep. Make that into a verb and you have to oversleep.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It also just takes the reading from 寝坊.
寝坊して、試合前に肩をちゃんと作れなかったんだ。
I overslept and wasn't able to properly warm up my shoulders before the match.
寝坊しすぎて、ついに社長から肩をたたかれた。
I overslept too often, so the president finally advised me to resign.
「しまった！寝坊した！」と思ったんですが、有り難いことに日曜日でした。
I thought, "Oh no! I overslept," but thankfully, it was Sunday.