The most common sleeping positions (and corresponding personality) identified were:
Fetal Position (41%) Curled up on your side, holding the pillow. The most popular sleeping position, this one was favored by 51% of the women in the study. The personality of these sleepers tends to be shy and sensitive, though they may present a tough exterior to the world.
Soldier Position (8%) Flat on your back with arms at your sides. Indicates a quiet and reserved personality who sets high standards.
Starfish Position (5%) Lying on your back with arms and legs outstretched. Indicates a good listener who makes friends easily, but prefers not to be the center of attention.
Freefall Position (7%) Flat on your stomach with arms at the head or ears. Indicates a brash and gregarious exterior who may inwardly be nervous and sensitive to criticism.
Log Position (15%) On your side with legs outstretched and arms at your sides. Indicates a social, easygoing personality.
Yearner Position (13%) Similar to the log, but with arms outstretched. Said to indicate a suspicious and cynical personality.
Professor Idzikowski went on to say that the freefall position aided digestion, while the starfish and soldier sleeping positions were more likely to lead to snoring and an overall bad nights' sleep. But it may be as difficult to change as your personality itself; fewer than five percent of people slept in a different sleeping position every night.
POLL: What's Your Favorite Sleeping Position?