Of course I did. I felt nauseous - which I usually do at nighttime anyway - and immediately decided it was down to carbon monoxide poisoning. I read that you're more prone to CO poisoning when you're asleep, and should go to another room, so I went to the bathroom. Not before swaying the bedroom door back and forth like a madman, of course. 

After opening the bedroom window (I'd been putting this off because spiders like to hide under my windowsill), I decided I'll be fine. Probably. ~~If not, it was nice knowing you all!~~