I sleep in what would be considered a relatively large master bedroom with ensuite. Recently got an AirGradient One sensor and was shocked at the overnight co2 levels.

When sleeping with window and door closed and just by myself, co2 levels exceeded 2,000ppm by morning and only fell once I was awake and opening doors.

With the window slightly open and the door slightly open, levels were at a much better 700ppm or so.

If this thing works as advertised, that would be great. There are a lot of situations where it’s difficult to sleep with the window or the door open.