I agree -- our bedroom is small and benefits from even a simple filter! However, my point was to humurously criticize the study title for sounding too conclusive. The study is useful as a starting point but it is pretty well known in such literature that one-night of introducing variable X can yield results showing negative short-term perturbations. X can even be something generally regarded as positive such as first night on low-stress vacation, or even the first few times people share a room with a partner. Changing a routine increases vigilance (not sure of proper technical vernacular for that, but you get the idea).
