Quote (Garethsir @ Tue, May 26 2009, 01:54am)
how long do fishes sleep?
does the depth in the water/ visibility make any difference?
It depends but every organism must undergo rest for every period of activity. I believe it has a lot to do with the re uptake of chemicals that are used for basic bodily functions. Essentially sleep is the resting period between activity, which literally is the essential of maintaining a balanced human physiology.