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Sleep environment

Bedroom CO2 is a possible sleep clue, but it takes a sensor to measure.

daygauge does not read CO2 sensors. You can log a ventilation habit, such as window open, in Quick Log and compare those nights with your sleep and heart readings.

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The question

Start with what your own data can show.

Bedroom CO2 gets attention because a room can feel normal while the air overnight quietly changes.

A hard cutoff would be false certainty. The useful question is whether your ventilation habit and your sleep moved together across repeated nights.

Quick answer

daygauge does not measure CO2 or import sensor data. You can log a custom habit such as window open in Quick Log and compare those nights with your sleep and heart readings.

Questions answered

What this guide covers.

  • Can bedroom CO2 affect sleep?
  • What CO2 level is too high in a bedroom?
  • Can opening a door improve sleep?
  • What sensors can track bedroom CO2?
  • Does daygauge measure CO2?
In daygauge

How the app handles this.

Signal
daygauge cannot tell you how much CO2 was in your room. It shows your sleep and the habits you log.
Confidence
Missing readings lower confidence instead of creating false certainty.When a reading is not available, daygauge says so rather than filling the gap.
Weekly Review
Weekly Review shows what changed, what moved with it and whether the pattern repeated.Your first Weekly Review is free. Later reviews are part of Pro.
Illustrative example

What this can look like in the app.

Example: on 6 nights you logged a window open, you slept 24 minutes more than on closed-window nights.

Example
Confidence

Confidence rises when the same pattern repeats against your own baseline and drops when key signals are missing.

Next move

Try one small change, log it, then see whether the pattern repeats over the next week.

Example 1

Example: resting heart rate was similar on both sets of nights, so the finding stays at hunch level.

Example 2

Example Quest: leave the window open for three comparable nights, then compare your sleep.

Research

Further reading.

These studies describe groups of people. They help explain the topic, but they cannot tell you what will happen to you.

Research context only. daygauge does not diagnose, treat, prevent or predict disease risk. Personal medical concerns belong with a qualified clinician.

Limits

What daygauge does not do.

  • It does not diagnose, treat or prevent disease, or predict your risk of it.
  • It does not claim one habit caused a result. It shows the pattern, how confident it is and what else changed.
Read next

Related guides.

Air quality can explain why the same walk does not always feel the sameThe useful screen insight is timing, not blameSleep midpoint can matter even when total sleep looks fine
On the App Store

Want to compare your sleep habits with your own readings?

daygauge is free to download. Pro is £8.99 a month or £49.99 a year.

Download on the App Store

Personal analytics, not medical advice