That was awesome, thanks for posting, it can save someones life.

I was working on my boat and it was winter. Built a structure around it and used the blue tarps for covering a wood frame. Then for heat since it was 20 degrees out, used a space heater that burned kerosene. It took the chill off things and kept the space warm about 65 and I figured not being sealed really well for a building it would have enough fresh ventilation.
Well one day felt a bit whoosy, that was all, nothing that I couldn't have ignored. So I continued to work, but then felt I the need to stop for a few minutes, so went to get some coffee. Well when I got out into the fresh air and started to pickup I knew what the problem was. Carbon Monoxide poisoning and I was shocked that I did not even really know it. Even had the slight headache when in the fresh air.
Now I understood why people could be in the backseat of their car and found dead without knowing why. I was surprised at the stealth of how it happened and if I had been a bit more concentrated on what I was doing it could have been the end.