My beardie did this for a little bit until I finally turned the furnace on this weekend...has it gotten colder at your place? Do you hold your dragon a lot or let him roam around outside his cage...it could be he is just bored. Also, it never hurts to remind to do a double check of your husbandry, baths? are the lights and temps okay? all those little things make a difference if one is out of sinc...