godan verb (-su)
go back to bed; go back to sleep
Used when someone gets up briefly and then returns to bed to sleep again, often in the morning or after waking too early.
朝早く目が覚めたけど、まだ眠かったので寝直した。
I woke up early in the morning, but I was still sleepy so I went back to bed.
休みの日は、
On my days off, I sometimes get up once, eat breakfast, and then go back to sleep.