Yes , fish do sleep. They need down time just like we do. Fidh need tine to rest and re-energize. 10 hours of complete darkness should be provided to them everyday. Having your light on a timer ensures that their dark period is consistent. Posted via Mobile Device
Fish have no eyelids to blink, their eyes are already moist, because they live in water. Since they have no eyelids, many people mistakenly think that fish do not sleep. Fish do sleep, they just stay very still in a quiet corner. Scientists believe they enter a rest state.
I think they do. The goldfish I have had would float in one spot at night where the current was the most gentle and start moving as soon as the room became a little light.
My betta Toki lies down on the bottom of his tank under a fake plant at 1 AM almost every night. He sleeps on his side and looks very dead lol. I freaked out the first time and turned the tank light on and he got up and flared at me like he was saying "Relax, I was just sleeping!"
After the move I gave Damian a shot glass for his tank and now I always see him resting in it at night! Nina either rests near the surface or near her shell, Tifa looks dead when he's sleeping, and Winston gets this glazed over look in his eyes. I've never caught Cameron sleeping oddly enough. He's hyperactive anymore.
I'v always wondered and now I know lol. Thinking about it, last night I woke and switched Clark Gable's tank on and he was resting on the filter not moving, I totally freaked out and tapped the top of the lid and he came swimming right over to me, I felt bad that I woke him but he gave me a scare lol