Can ? Tropical fish can sleep. Any fish can sleep, but because fish have no eyelids, it is difficult to distinguish when they look the same when they sleep from when they are awake. But usually the sleeping fish will not swim, it will stay in one place for a long time, once there is a vibration to wake it up, it will often swim immediately. In order for the fish to rest well, it is best to turn off the lights at night.
of fish sleeping? 1. Avoid enemies: In order to avoid being attacked by enemies during sleeping, fish often avoid them. There are many ways to avoid it, and common fish hide in water plants or stones. There are also some bottom-dwelling fish that bury themselves in the sand. Some fish can spit out bubbles to wrap themselves, so that the other side can not eat.
2. Sleep with your eyes open: As mentioned above, most fish don't have eyelids, so they sleep with their eyes open. For diurnal fish, there is no light at night, so they can sleep peacefully, while nocturnal fish are more photophobic and tend to hide at the bottom of the water or rest in caves during the day.
3. Sleep while swimming: Some fish have a special body structure and need to keep swimming all the time, otherwise they will die. The same is true of these fish when they are asleep, so it is difficult to tell whether they are awake or not.
