Why most sleep trackers don't tell you about your breathing.

I get this question often enough that I want to write the long version of the answer.

"My Apple Watch / Whoop / Oura tracks my sleep and gives me a score. Why doesn't it just tell me about my breathing too?"

The answer depends on the product. Supported wearable features vary by sensor, model, software, region, and eligibility; a bedside phone adds a separate room-audio signal.

Wrist sensors can't hear the room

Consumer wrist and finger devices use different combinations of supported sensors and algorithms. Their outputs may include sleep, movement, heart-related, temperature, breathing, or notification views, depending on the product.

What a wrist or finger sensor does not capture is room audio. A bedside microphone can add snore-like sounds, quiet intervals, gasps, and other acoustic context, while the wearable contributes its own sensor-derived view. Neither signal should be treated as a diagnosis.

This is not a criticism of wearable devices. It is a scope distinction: a phone microphone can add room-audio context, but it cannot reproduce the wearable's contact-sensor signals.

Different sensors answer different questions

Apple Watch, Oura, and other wearables use their own wrist- or finger-based signals to produce sleep, recovery, breathing, or notification views. Their supported features and eligibility can change by model, software, and region, so use each maker's current documentation for the exact claim.

A wearable result can be useful on its own. SomniSense does not need to declare it incomplete or wrong. The additional value is a separate acoustic record: where the phone model marked a candidate region, its estimated type and duration, the waveform, whole-night position, and any local audio available for review.

The two views are complementary. Agreement does not prove a cause, and disagreement does not establish that either product failed.

The whole reason I built SomniSense the way I did is that, after enough nights of being told "your sleep was disturbed" without knowing what disturbed it, I wanted to hear the disturbance. The data is more useful when you can verify it.

Why "we cover everything" is a hard product to build well

SomniSense deliberately stays narrow. It organizes bedside phone audio into candidate regions that can be located, inspected, and—when audio is available—played back. It does not try to reproduce a wearable's heart, recovery, fitness, or sleep-stage features.

That narrower task has an equally important limit: the phone does not measure airflow, blood oxygen, respiratory effort, EEG, or anatomy. The useful product choice is to keep the acoustic evidence detailed and its boundary explicit.

So which one should you use?

Both can be useful if you already have a wearable. Read the wearable within its own documented sensor and product scope. Read SomniSense as candidate phone-audio evidence. Neither view automatically explains why the other changed.

If you do not have a wearable, SomniSense can still create its limited phone-audio wellness record without additional hardware. A wearable remains a separate choice for the features its maker documents.