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sleeping in late; oversleeping
late riser; sleepyhead
目覚ましが鳴らず今朝寝坊してしまった。
The alarm didn't ring, and I overslept this morning.
寝坊して授業に遅刻した。
I overslept and was late for class.
休日は寝坊することが多い。
I often sleep in on holidays.