Goldfish are vertebrates like humans, so they also use sleep to relieve fatigue. Nowadays, many families raise goldfish because they symbolize good luck. In daily life, it is estimated that many people have never seen goldfish sleep. Generally, goldfish sleep for a short time, and the sleeping time is not fixed. They are different from human beings who sleep at night. Most of the time, they sleep in an instant. Maybe in the blink of an eye, they have already slept. In fact, goldfish sleep like awake, with their eyes open, mainly because goldfish have no eyelids, and they can't sleep with their eyes closed.

goldfish can easily tell when they sleep. When they sleep, although their eyes can't be closed like humans, their bodies won't move. If they are found to be drilling into the sand or hiding in a dark place at night, they are basically sleeping. When goldfish sleep, they will have a phenomenon, that is, they will blow a big bubble, and they will get into the big bubble, so that they will feel safe. Besides, many fish sleep like goldfish, but when they sleep, it is difficult for human beings to find them.