Oh yea, I did it ... once! That was enough :P I do use a sleeping bag on my bed.. it's cold in Englandshire and sleeping bags are nice and cosy.. I think they were made to go on beds :P
I'm confused: first you state that you did it I once, then you stated that due to the weather, you keep one on your bed. Doesn't that mean more than once? (I guess you mean that you sleep on top of it and not in it.) __
I don't know if it was 'sleeping' --------- As a teen, I was camping out with my cousin. It was late at night when we arrived at some state campground in B.F. Michigan. We set up the tent and went fast asleep in our sleeping bags. About 3a.m., we awoke to the sound of a train coming fast in our direction! We had set up our tent at the base of a railroad embankment. The Michigan State Parks people had chosen a bad spot for a campsite!