Wrasse sleeps early - Is this ok?

[As I mentioned on other threads, I've recently added an ornate wrasse to my reef tank. When the lights go out, poof - it's in the sand sleeping. A couple times this week, he's gone to bed a couple hours before lights out.

Does this indicate a problem?]
 
[It may hide early as an act of self preservation.

Amazingly, my wrasse used to go to sleep within seconds of lights out. It knew the precise time each day.]
 
[My cleaner wrasse always went to bed about an hour before lights out. As long as your fishie is active, eating and otherwise healthy, there should be no need for concern.]
 
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