Dragon going to bed too early?

[eileithia]

OK..so the last 3 days, Timba has put himself to bed at 8 pm!? I come down to check on him..and he's tucked between his two rocks sound asleep..then, in the am at about 7, when I turn the lights on..he's still asleep. Isn't that too long for a beardie? He's only 3 months old. Eating tons of crickets each day and we take him out for about 3  half our segments at least each day and let him run around or be with us. He's quite active...but still? 
Any thoughts?