1A nap or siesta taken during the day, especially in the afternoon. Used as a noun and can be expressed with the verb form (to take a nap).
昼食のあとで少し午睡をしたら、頭がすっきりした。
After lunch I took a short nap and felt refreshed.
赤ちゃんは午後になるとよく午睡をする。
The baby often takes a nap in the afternoon.
仕事の合間に5分だけ午睡する習慣がある。
I have the habit of taking a five-minute nap between work tasks.