Does Fish Sleep ?

Does Fish Sleep ? Yes , Most fish does sleep but however, fish don't have eyelids. Sharks is the only fish with eyelids. Sharks mostly have to sleep while still swimming. Some fish makes it obvious they are sleep because some fish just rest on the botton, or a coral crevice, and parrotfish secrete a mucus "sleeping bag" around themselves before going to daydream mode. If you were to get up quietly during the night, you will see your fish hovering at the bottom over the tank. It's just a minimum of motions with theirs fins which keep them in one position. And if the fish is sleeping longer then usually then one can put food in the tank to wake the fish up.

Most fish switch off to sleep mode when they see they are in a safe area. They are just motionless in one spot when they are sleep, or they build a nest or nestile themselves into seabed or coal. Fish are saving energy when they are sleep but they are on point and aware when something is going or about to happen under water.