Yellowfin Flasher Wrasse Sleeping in sand behind a rock during the day. Normal?

Hey guys! Just wondering, my new Yellowfin Flasher Wrasse looks healthy and is eating just fine but is burying itself half in the sand behind my LR for parts of the day. I have no aggressive fish whatsoever and I just wanted to ask the experts as I am new to wrasses.

100gal, water parameters are excellent, all fish are non aggressive, the wrasses I have are Melanurus, Flasher, and Leopard.

Thanks!