Gryffindor: They sleep on their backs mostly. They sleep with just enough blankets to stay warm. They may sleep with sentimental things, or not.

Ravenclaw: Move around a lot while sleeping, sleep heavily. They usually fall asleep on their stomachs or sides. It is vital that they be warm, and they often cradle their pillow with their arms. They tend to stay up late.

Hufflepuff: They are extremely adaptable concerning positions. They prefer background noises, if they're used to them, and usually sleep with a lot of blankets. Hufflepuffs like to get to bed as early as possible.

Slytherin: Light sleepers, they usually fall asleep best on their sides. They prefer some white noises, but are flexible.