Fish Sleeping

[dionysusjg]

Hi all,
This may be a funny question, but how do fish usually sleep?
Up until now I have never really paid much attention to it, but since all my fish have been in the ht, I can now see them clearly when 'sleeping'

I'm not sure what is 'normal' behaviour.
My chromis seems to sit upright, but motionless behind my heater,
My male clown swims slowly behind the return stream,

but the one I'm concerned about is the female clown, who has been sick recently, seems to sleep motionless on her side at the bottom of the tank, and every morning, I think she's dead, until I tap the tank and she jumps up.
She may have done this all along, and I've only noticed it recently, however I just wanted to know if this is normal behaviour, or whether I should be concerned.

cheers

[FragFarmer]

My little clown lays on his side inside an empty clam shell. He's absolutely adorable when he's sleeping.

[degibson84]

all fish are different. my CBB just floats and the first night i had him it freaked me out cause i thought he was dead.

my bicolor blenny goes into a hole in a piece of rock and you dont see him then when the lights come on he swims out of the hole