Now on to the different sleep positions and what they imply about your temperament. If you tend to sleep on your side with your legs curled up in a ball and your arms snuggled in close to you, then you’re a fan of fetal position. This is the most popular sleep position, and it indicates that while you may be tough around the edges, you are actually sensitive and shy on the inside. The more curled up you sleep, the more comfort you seek.