Having read a few studies myself I got a CO2 monitor (from AirThings, also monitors VOCs, temperature, humidity etc). From which I can confirm that CO2 builds to quite high levels in an unventilated room within an hour or two. But even leaving a window only slightly ajar helps a lot.
Apparently fan heating and air conditioning systems may or may not mix in air from outside—many just recirculate the same air—so switching these on may or may not help with ventilation.
Some studies suggest high CO2 also harms sleep—though again the research is inadequate. If so, sleeping with the window slightly open should help; if cold/noise makes this impractical, sleep with the bedroom door ajar (if there aren’t other people around) and a window open in another room Or even if no window is open at all, having your bedroom door ajar seems to help by letting the CO2 out. I’ve done this for the last year, though can’t be sure if it’s helped my sleep.
A confounding factor is that it’s best to sleep in a cool room, which opening a window also achieves. Either way this is an argument for opening a window while you sleep.
Having read a few studies myself I got a CO2 monitor (from AirThings, also monitors VOCs, temperature, humidity etc). From which I can confirm that CO2 builds to quite high levels in an unventilated room within an hour or two. But even leaving a window only slightly ajar helps a lot.
Apparently fan heating and air conditioning systems may or may not mix in air from outside—many just recirculate the same air—so switching these on may or may not help with ventilation.
Some studies suggest high CO2 also harms sleep—though again the research is inadequate. If so, sleeping with the window slightly open should help; if cold/noise makes this impractical, sleep with the bedroom door ajar (if there aren’t other people around) and a window open in another room Or even if no window is open at all, having your bedroom door ajar seems to help by letting the CO2 out. I’ve done this for the last year, though can’t be sure if it’s helped my sleep.
A confounding factor is that it’s best to sleep in a cool room, which opening a window also achieves. Either way this is an argument for opening a window while you sleep.