Possible hibernation attempt. Immediately place your hedgehog on your skin on your chest or stomach. Bundle yourself and continue this slow increase in temperature via skin contact until your pet is warm on their stomach and shows normal activity. You will need to increase room temperatures of your heat source (che) and can provide some additional source of heat in the cage such as a Snuggle Safe Disc as subsequent attempts to hibernate are likely. Monitor your pet closely. If this problem persists, see your veterinarian as it may be an indication of serious illness.