I would not repot at this time. Some yellowing of leaves is to be expected as we go through fall and into winter. You can continue to water just a bit and less frequently. If it drops all of its leaves allow to dry more, but still a very small amount of water, as it may be semi-dorment. Mine hold their leaves through the winter but I keep them warm. In the spring when new leaves begin to show, you could repot to a slightly larger pot but don't over pot as this can lead to overwatering. Just my opinion... others will add, I'm certain.

Thanks a lot for the information. I'm really new at this, but enjoying it thoroughly. I do appreciate you taking the time to respond! Can I ask how often you water during the winter? Mine will be inside as well under a gro-light at temps of about 65.

Mine are moved into a greenhouse with daytime temps in the mid to upper 60's and nights in the lower 60's. Moderate humidity because they are in with orchids that get watered weekly. I water many succulents about 10 days or more and some not for weeks. You have to watch your plants. Things like Echeveria will get soft leaves meaning they want water. If they don't perk up may indicate root rot. Dorstenia just get some water every 10 days or so except D. gigas, lavrani, horwoodii and gypsophila which get less. You may find this link helpful:http:// www.bihrmann.com/caudiciforms/