Excess activity and refusing food are both red alert signs. IMO, I would take him to the vet tomorrow to be checked out. Hedgehogs are very good at hiding injuries, and you have to watch closely to notice any warning signs. Changes in activity, eating, drinking, and personality are all warning signs, as well as changes in the poop & urine. Red or orange in the poop or urine is blood, black sticky poop is blood that comes from further up in the digestive system (which means internal bleeding - emergency situation).