Actually it started just before we had that record cold snap in feb..(im in michigan..we had single digit and below zero temps at night for about 2 weeks straight). But i guess i didnt realize they could still detect what going on outside even though he is kept in a toasty warm house. Hard to control wood heat...house is generally 75-78. So if this in normal winter time behavior then i guess i wont freak out too much. Hes just over a yr old and i didnt think he would go through that just yet as he is still slightly growing...will update in a few days