What is your outdoor air intake solution: Is your home drafty? Do you leave a window open in your bedroom at night? Does it have a fan in it that either pulls a

What is your outdoor air intake solution: Is your home drafty? Do you leave a window open in your bedroom at night? Does it have a fan in it that either pulls air in or pushes air out? Do you have a window open elsewhere in your home that has a fan in it? Does your home HVAC pull air in from outside and pump it into your room? Do you use fan-only recirculate mode? CO2 measurement gadgets are useful for measuring how stagnant your air is, but the above parcel of questions is a great predictor: if your answers are No for all questions, then you’re probably spiking CO2/humidity uncomfortably high at night. Changing any of those answers from “No” to “Yes”, in any way that increases the amount of indoor air exhausted outdoors from your bedroom, and/or outdoor air drawn into your bedroom, may help a lot. Measuring relative CO2 levels using daily graphs from a gadget is an excellent indicator of whether any change had an effect.