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It's no secret that sex can lead to sleep, but it turns out that sleeping a certain way can also lead to more sex. 

New research conducted by Mattress Advisor has found that the way couples are hitting the hay actually has an effect on how much they get busy between the sheets - and that some of the most popular positions out there are less than romantic.

According to the survey of 1,000 people, falling asleep while facing each other with limbs intertwined is the position that correlated the most with sex, with people sleeping in this position rating their frequency of sex sessions at a 4.2 out of five.