Koi fish sleep for about several hours every day. Their sleeping habits are closely related to their living environment. Generally, they enter a sleeping state after dark and wake up before dawn. Their sleep time is mainly concentrated from 1 am to one hour before dawn, as well as within three hours after 12 pm. In the natural environment, koi fish like to hide among waterweeds to rest.
The sleeping time of koi fish is not fixed. They may sleep several times a day, with each bout lasting about 20 to 30 minutes. When the light is turned on, the koi fish will wake up slowly. At this time, if you feed them some food, they will eat their fill and then play on their own for a while.