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I can only fall asleep on my belly with my head to the left. I fall asleep very fast but I wake up often....any remedy for that? Does meditation will help in this situation too?

Well... it kind of depends on why you are waking up. Do you perhaps have a bad habit of stopping breathing during the night (like myself)? If so then your belly position is one of the better positions to be in - but you may want to look into getting your sleep tested.

Sleep apnea can easily rob a person of a third of their effective sleep each night. If this is not you and you have no snoring issue then 'belly with head to the side' is also similar to the 'recovery position' - and perhaps experimenting with other sleep positions might help.