Do Fish Sleep?

Fish do not sleep like we do, but they do exhibit behavior that is sleep-like.  Fish don't have eyelids that close so they do not close their eyes.  However, at night you will notice that their movement slows and also their breathing slows.  They pick a spot, usually out of the current, and remain relatively stationery.  Fish never completely zone out of their environment though.  They can sense movement in the water and remain guarded and on the lookout for predators.  Fish also use their keen sense of smell and taste at night.