Room temperature, cortisol and BRI: what can your record tell you?

A comfortably cool room can make it easier to fall asleep and stay asleep; NHLBI recommends a cool, quiet, dark bedroom. That is useful sleep-environment guidance, not a way to read a hormone level from the room or your phone. BRI does not measure cortisol or body temperature.

If your reading changes, first compare recording coverage, marked moments and the available sound. SomniSense, a sleep apnea detector app, gives you a sound-based record to inspect. Your record can show what the microphone captured while room conditions varied, without proving that temperature or stress caused the difference.

SomniSense does not measure cortisol, core temperature, oxygen, airflow, airway anatomy, or sleep stage. It should not attach those mechanisms to one person's acoustic result.

Start with the recording conditions

• Keep phone distance and orientation reasonably consistent.
• Note unusual room noise, travel, a partner, pets, or device interruptions.
• Check how much of the night was recorded before comparing nightly values.
• Use several comparable nights rather than one dramatic result.

Add context with tags only if you want to

You can review one completed Night Report without adding a tag. Open a marked moment, inspect the waveform and listen to the available sound before and after it. If you choose to use the app’s available tags for context, the app can compare its own acoustic observations between tagged and untagged nights, with sample sizes visible. Untagged means no label was recorded, not that the factor was absent.

The difference is descriptive. It does not establish a physiological pathway, prove cause, or show that a routine or treatment worked.