Do bettas sleep with light on?
Bettas like light so that they know when to wake up and prefer a darker environment to sleep in. You may have an aquarium light on your tank and if so, it is probably best for you to turn this on when you wake up in the morning and turn it off just before bedtime.
What time do betta fish go to sleep?
Bettas sleep during the night, when it’s dark. If you leave your aquarium lights on 24 hours a day, you are not providing an environment where your betta can sleep well.
Do betta fish stop swimming when they sleep?
(However, they do like to nap in the day as well.) The best way you can tell if your betta is sleeping though is as previously mentioned, to look at his gills. While the rest of his body will be pretty idle, his gills and mouth will be slowly moving as he continues to breathe in and out.