How to Say "Nap Time" in Japanese

お昼寝の時間

ohirune no jikan

To say nap time in Japanese, use お昼寝の時間 (ohirune no jikan).

It is used for a daytime nap, especially the nap time of small children at home or in nursery school.

What does it mean word for word?

お is a polite prefix, 昼寝 means a nap, の links the words and 時間 means time.

It is pronounced ohirune no jikan.

In Japanese offices, a short nap is called いねむり ('inemuri'). Unlike 'nap time', which implies a scheduled break, いねむり refers to the social acceptance of falling asleep during a meeting or on a train as a sign of exhaustion from hard work.
The polite prefix お in お昼寝 is an example of 美化語 ('beautification language'). Using this prefix doesn't just show respect to others, but makes the act of napping sound more refined and gentle.
While お昼寝 is for children, adults may use the word 仮眠 ('kamin') for a strategic nap. This term literally means 'temporary sleep' and is often used in professional or medical contexts to describe a power nap.

お昼寝の時間よ。
It's nap time.
Adding よ at the end gives a gentle, friendly tone, like telling a child it is nap time.
Tatoeba #9533490 by small_snow, translation #8784609 by Amastan
そろそろお昼寝の時間だよ。
sorosoro ohirune no jikan da yo.
It is almost nap time.
お昼寝の時間はいつですか？
ohirune no jikan wa itsu desu ka?
When is nap time?
1 more sentence on Tatoeba

A mother talking to her young son in a living room.

結衣 Yui

陽太、もうお昼寝の時間だよ。
Youta, mou ohirune no jikan da yo.
Youta, it is nap time already.
陽太 Yota

まだ遊びたいよ。
Mada asobitai yo.
I still want to play.
結衣 Yui

ダメだよ、お昼寝の時間だよ。
Dame da yo, ohirune no jikan da yo.
No, it is nap time.
陽太 Yota

わかった、寝るね。
Wakatta, neru ne.
Okay, I will sleep.

Sources

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