What do clown fish do most of the day?

How clown fish sleep ............

the fish go down to the bottom of the tank when every has gone too bed or gone upstairs and they get to the bottom of the tank and go to sleep

Some additional info:

Fish do not have eyelids nor do they experience a deepened sleep pattern like our REM.

They do 'sleep', just not as we know it, they become less active and their metabolism slows down.

Some tuck themselves away while others will lie on their side and float, typically locating the same area to do so.