Do Clownfish ever sleep?

My clownfish have always slept. In my nano they used to sleep up against the back wall, just sit there like they were dead, floating against the wall. In my current tank, my clownfish sleeps deep within my torch coral, to the extent that I can't see him unless the current blows the tentacles just the right way where I can see a little bit of him sticking out.
 
My clowns sleep every night when I turn off the T5s and turn on there night lights.....They get against the back wall of my cube behind the powerhead and almost float like they are dead....It was creepy the first time I seen them, I thought they were dead!!
 
Mine sleep together in the front corner of my tank.

They wiggle together consistently, and it almost seems like their stuck there, until the lights go on.
 
mine sleep but i have yet to figure out where they just dissapear when the lights go out then in the mornin there they are!
 
My false percs sleep in a bed of anthelia.

My black saddles are always wiggling near each other or are stuffed into their carpet at night....they look like a fish taco
 
mine do, they turn all pale while they sleep also.

sleepy.jpg
 
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