Careful there, Iliketips.com might think you're not a human. Don't worry though, because I think you are human.... No, really.... I swear...
Maybe not only human sleep like this. It is hard to make some examples now! But I do believe that point!
So I think that fact we are the only who sleep on back is an original feature and mark us from animals and other creatures on the planet. So I like to sleep that way, but do sleep on the torso frequently.