Looks like carbon monoxide.
Something to be said for a drafty kabin at the KOA!
http://www.cnn.com/2013/06/11/us/north-carolina-hotel-deaths/index.html?hpt=hp_c2 (http://www.cnn.com/2013/06/11/us/north-carolina-hotel-deaths/index.html?hpt=hp_c2)
wow, crazy shite. but sometimes, our kabins aren't drafty enough, depending on who else is in the kabin and what they ate earlier...