ok dan,i call it hibernation as opposed to brumation,which i have always considered a more brief 'down time',say to jump start a feeding response,etc....i would think the amount of activity is going to be determined by any fluctuation of temps,etc...of which there would be none if we keep the temps more or less steady somewhere between 45-55,as opposed to natural warm spells,etc. they'd exp. in the wild...nevertheless,i keep a fresh water bowl 'within reach' for them....when i say stressful,i mean more to their system,due to lowered resistance to these 'introduced variables' as you say,which i agree with-seeing as how i hear about snakes being lost while in this proccess at a higher rate compared to when they are not dormant,that is what i was talking about.