Yes they do sleep. How do I know? I have goldfish at home. In fact they are sleeping right now. They keep their body still, but still move their fins so they won't sink. Yes,fish do sink. Sharks are fish and do almost the same thing. They just swim while they are sleeping. Fell free to ask more fish questoins. Im all ears.

• Do fish sleep? (as in gold fish)?
• Angel Fish? Cat Fish? Or Gold Fish? which type of pet Fish do you like better?
• For my commet gold fish can I just but it in a fish bowl ?
• What kind of colorful fish can u put in with gold fish??
• When fishing for salmon are you allowed to clean the fish of the fish eggs then throw fish back in water?
• Do fish sleep?
• Do fish sleep?
• Do fish sleep?
• Gold fish?
• DO fish SleeP][][][[]][]]adding charactersXD?