So what does all this about sleep positions meaning really come down to? What is the truth about sleeping positions personality analysis? While there may not be any solid research to prove any direct connections between sleep positions and personality, Philip Gehrman, a professor of psychiatry and a member of the Penn Sleep Center, explains “you can’t argue with the fact that [surveys] did in fact find a correlation between sleeping position and personality.” Just take this information with a grain of salt, as the link between sleeping habits and personality isn’t yet strong enough to draw any solid conclusions. All we know is we sleep in fetal position every night, and they nailed it.