It's funny because I thought the same thing until I wrote an essay in school on the study of different fish species. The scientific explanation is that fish do in fact sleep , they just isolate themselves from that which causes vibration in the water or current which pulls them backwards (can actually drown them). They lie at the bottom of the ocean and stay completely still.
Hope that answer your question
fishes do not have eye lids, so when they are awake or asleep, their eyes are always open.
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