After that Volt caught on fire weeks after an accident, there is no way in hell I would sleep over one in an attached garage.
I heard a safety guy say the other day that the Volt in question had been used in a crash test and that the safety protocols after a crash ( which include draining the batteries) was not done! So the thing caught fire three weeks after the crash. Sounds as though someone screwed up. At any rate, are you happy sleeping over a car with twenty gallons of gas in it?