Do some fish sleep

Answer 1

Summary: Fish do rest but their "sleep" is different than land animals. Although most fish "sleep", some are still under speculation because some animals need to move to survive, similarly to a shark.

Most all fish spend time in an energy-saving state that can be called

"rest", and we might even call their behavior "sleep", though it is probably

different than "sleep" in most land

animals. Many fish, like Bass and perch, rest on or under logs at

night. Coral reef fish active in the day, hide and rest in crevices

and cracks in the reef to avoid being eaten at night.

The resting behavior of fish is very different from their behavior the

rest of the day. Many minnows, for example, which are very active in

schools during the day, scatter and remain motionless in shallow

water at night. Many fish "rest" or "sleep" during the day and are

active at night instead, but almost all fish sleep.