While the common belief is that wolves sleep cuddled up to one another in wolf dens, they actually sleep out in the open regardless of weather conditions. Wolves establish their sleeping spots by circling the area prior to lying down.
All wolves travel in packs. Mother and father wolves are referred to as alphas. The alphas hunt for food for their young. They also choose den sites and territory for the pack. Wolves communicate with one another through howls and whistles. The theory that wolves howl at the full moon is based on the fact that wolves tend to howl more frequently when the dark nights are lighter due to extra moonlight.