Why do people smile in their sleep?

for some reason i smile in my sleep. i've slept over at friends houses and i'll wake up to them telling me i smile in my sleep and not just once but every time. i've heard of people talking in their sleep or sleep walking but what do you think makes me do that? and it's obviously a more than once... show more for some reason i smile in my sleep. i've slept over at friends houses and i'll wake up to them telling me i smile in my sleep and not just once but every time. i've heard of people talking in their sleep or sleep walking but what do you think makes me do that? and it's obviously a more than once occurrence.
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