Actually, that's exactly what I did, I just didn't elaborate: each bagged snake was put into a plastic 'Critter Cottage' w/ ventilated tops, & THEN under my down
comforter with me. As you said, protection from roll-overs, protection of MY bedding in case --it happens, & better assurance of air flow. My dogs have their own beds & blankies, so they did their own warmth.
But sadly the power didn't come back on for days, so the next morning I got up after I planned my next move to keep the snakes warm: that's when I
changed them over to ice chests & jars of hot water...I was honestly surprised at how well it worked. The jars I used were large, like what instant iced
tea crystals come in, and I have them saved in a box in my garage, ready in case there's a next time. (pickle jars would work nicely too)