Similar story. Expected a 41 degree night, so I turned on the furnace and set the tstat on 60 something. I was startled awake to an awful smell, and the smoke detector screeching. We have had so many problems with our new MH that DW mentioned more than once that she hoped it did not catch fire while we were sleeping.
I sat up and could see there was no fire, and I recognized the exchanger oil smell. DW was groggy, with no glasses to verify our safety. In her panic she firmly kicked me in the back while trying to exit the bed, screaming "hurry up" assuming we trying to flee with two kids from a MH fire. While I wasn't fond of the kick, at least I know I can count on her to move out fast if there is a real emergency.
Two nights later, with all appaliances off, we were greated to a (false) CO alarm. I was out of bed in seconds