I have a 20"-22" ball and he seems to be in his water bowl most of the day. I have checked for mites and did not see any. The temps are (hot)90-92.3 and (cold) 75-80. I have talked to a few different people and some say that he can be hibernating. Others just say watch him to make sure that he maintains a healthy weight. Does any one have any suggestions? Thanks for your time.