It would be interesting to see how long they would stay down on their own--without risking health. Like you say--they show little loss of weight so that deep hibernation does not appear to do anything detrimental to them.If it were me-- I would leave em be just because I am lazy! Also--what if they don't want to wake up yet?? I had one ( the crippled one from Eddington ) that I recieved in mid Feb ( I think) and it went under and stayed until late May. I don't remember if JohnE had it active or in brumation.