Question

Do fish sleep?

Answer 1

Sleep:

1. Sleep is defined by the existence of normal patterns of electrical activity in the brain, including in the neocortex.
2. According to research, fish do not "sleep" in the same manner that most mammals do.
3. Fish lack eyelids and the neocortex, which are two characteristics of sleep that are distinguished by their absence.
4. When fish are alerted to a potential hazard, scientists have discovered that their metabolism and activity decrease.
5. Scientists have discovered that although fish are attentive to potential danger, they limit their metabolism and activity; these intervals of "supposed" inactivity may have the same restorative functions as sleep in other animals.