Stick your head under a blanket and you very quickly feel uncomfortable from your own CO2 you're breathing out.
I start to feel like this towards the end of the night if my room has no air exchange or air circulation. It's winter time now and so my wife wont allow me to open windows for fresh air exchange and circulation (lol) So I got a ceiling fan that should do the job (but no exchange)
Just wondering, is it plausible that if we sleep in a room where there is no air circulation, that we inadvertently breathe back in the CO2 we breathed out (if we were to 'see' CO2 would we see our heads enveloped in a higher concentration CO2 cloud).
I have yet to get to get it installed but I am guessing it should help me to breathe easier. Is it a plausible enough hypothesis that a lack of air circulation or exchange over a night in a bedroom will cause CO2 concentrations (especially around the source ie your heads) to rise. Obviously not enough to do any life threatening damage but enough to feel uncomfortable and cause sleep disturbance. There is no fresh oxygen sources coming in but there is sources of CO2.
As I also have a Son and another baby on the way I looked into it and apparently having a fan on can reduce the rate of SIDS. Could this reason be a major factor in SIDS and why co-sleeping can make it worse (2 extra heads next to the babies breathing out CO2).