According to a new study, sleeping on your stomach increases the likelihood you'll have erotic dreams.
Researchers at the Shue Yan University in Hong Kong got 670 students to fill out surveys on their dreams and in what positions they slept, reports the Daily Mail.
Several themes came up consistently when people slept on their fronts – being admired by a famous person, being tied up, being immobile, persecution, and of course, sex.
"This study provides the evidence that dream experiences, and in particular dream content, can be influenced by body posture during sleep," says researcher Calvin Kai-Ching Yu.
"I believe that the brain during sleep is not at all totally detached from the external world, and stimuli, including those stemming from the environment, are probably incorporated into dream content more often than people observe or are aware of."
He says the sexy dreams are the result of not getting as much air while you lie on your front, as opposed to lying on your back, which the mind interprets as "constriction".