Do you have any cites for the idea that having a few plants in a normal sized bedroom is problematic? That seems really implausible, especially since bedrooms aren't air tight, and the CO2 presumably diffuses throughout the entire house. I'm not talking about sleeping in a rainforest here, just having a few plants.

Also, a lot of people sleep with another person in the room, do plants really emit more CO2 over the course of a night, than another person would?