Funny. What makes you think they didn't sleep? Large bags under their eyes? Sorry. Couldn't help that.
How long have they been in the tank?
Because as a routine when I wake up at 6 am they are always steady inside a shell that comes out on one of the live rock and this morning they where at the same upper corner of the tank gasping just lime last night 10pm.
how is the flow in your tank? is the surface of the water "disturbed" sounds like an O2 issue to me. BUT when i had the terrible break out of brooklynella it started with 2 O. Clowns doing what you are describing . any discoloration on the fish. white spots. blotching? excess slime?