I agree he's probably not feeling well for some reason. He's not really brumation because he's not sleeping. My 10 yr.old boys are both sleeping now for almost a month and they never have a black beard and they rarely wake up. One will wake up for a little water or a few bugs during brumation , he just started doing that [ waking up ] this year, in the past he always slept through for about 3 months solidly like his brother.
I hope your boy is O.K and there will just be something easy to correct or easy for him to get over.
I hope your boy is O.K and there will just be something easy to correct or easy for him to get over.