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You are all right in some respect, and I get it Sqad, but always thought it was trapped wind from food digesting.
This was a big ball of wind in the centre of my chest, which eventually dispersed.
Scarlett - yes I also get acid reflux, often during the night when lying down, usually after a big Indian meal. My own fault i know, but I just luurrve Indian food (I do get a high when I eat one after not having had one for ages).
And yes Mosaic, I got quite a roasting this morning (from she who must be obeyed) for snoring during the night. Actually woke her up - an unforgivable sin.