Like many other animals, goldfish also need to sleep. When they enter the state of sleep, they can eliminate the fatigue of the nervous system and limbs. However, their sleeping state is not obvious, and it needs careful observation to know that they are sleeping.
Because goldfish have no eyelids, they don't close their eyes like other animals when they sleep, but sleep with their eyes open. However, if you look carefully, you can still observe their sleep state. They like to sleep in the dark at night. Before they go to sleep, they seek a relatively safe and stable place, such as in the water and grass. When they find their position, they will stay here, reduce their activity, slow down their breathing, stop moving, and become numb. This is sleeping.
Their body color may also become slightly lighter while they sleep. Their front fins may also wiggle slightly, but this is just to maintain balance, which does not mean that they are awake. If they suddenly turn on the light when they are sleeping, or if there is a sudden loud sound, they may wake up immediately and return to normal after a period of time. In addition to sleeping in the water grass, they can even float in the water to sleep, which is very interesting. In addition, they may sleep at a fixed time, similar to the human biological clock.
