Mostly on side but i can sleep in almost any condition. Also no volume of noise can wake me up except my phone alarm. One time i had workers jackhammering under my open window(3rd floor) and i didn't woken up until my alarm sounded. Still i wonder how i heard it in that noise (IMG:[
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style_emoticons/default/biggrin.gif). But the sad and annoying thing is that i usually wake up any time if somebody move nearly.