How often are you watering it?
Make sure you dont water it too much during the winter time. These kinds of plants store water in their thick leaves.

About once a week? Sometimes longer.
Is that too often?

it could be lack of light causing it to stretch and lean towards its light source?

First, your mix is very heavy. I know you bought something that said, "Cactus and Succulent" mix but many of these are not really designed for their indicated purpose. Your soil looks very wet; you may have just watered. You don't necessarily have to change things, just don't water as much allowing things to get on the dry side. Next, I would agree with the above comment regarding light. Notice the difference in the diameter of the lower portion of the stem and the top as well as smaller leaves at the end. Your plant is becoming etiolated in its search for more light. These want almost full sun for 6 ~ 8 hours a day which might be difficult in northern climates without supplemental lighting.

Unfortunately, 'decent' light is not enough. As already pointed out, full sun for min. 6hrs is what it needs. But it's winter & we 'up north' have to give succulents some extra light. Sunniest window possible, close to it so plant gets as much natural light as available and it would be good to add some supplemental lighting. It would help to turn the pot 1/4 turn every week or so to expose all sides to light source (& it won't grow leaning to one side).

The pot looks huge & it is very easy to overwater plant in so much soil.

If handling, try not to rub/touch the leaves too much. It will rub off that nice 'powder' (a.k.a. bloom or pruinose) on surface.

This post was edited by rina_ on Fri, Jan 16, 15 at 23:41