[Baron Munchausen]

hehe...

I think what he is asking is whether fish 'sleep' like we do. And as far as I know most of them do not, though they do have dormant periods where they hide if they have a 'home' to hide in, or just drift slowly if not. But they can be roused pretty quickly if disturbed in this state. It's not like 'sleep' in mammals where you are totally unaware of what's going on around you. Aquatic mammals have to do something weird where one half of their brain 'sleeps' while the other half stays awake because they can't afford to stop swimming.