Apple Watch sleep stages and a separate sound record.

Apple Watch estimates time spent in REM, Core and Deep sleep, as well as possible waking periods. These are the sleep-stage estimates shown in its Sleep view. SomniSense does not measure those stages; its bedside recording answers a separate question about the sounds around a possible breathing pause. Check Apple’s current guidance for your device and setup.

SomniSense does not reproduce, import, or verify Apple Watch sleep stages or notifications. It adds a different input: bedside phone audio.

Different signals, different outputs

A wearable view is valuable on its own. SomniSense can separately organize candidate sound regions by model-estimated time, type, duration, marked waveform, available audio, and whole-night position.

Neither output should be used to explain the other. Apparent agreement is not clinical confirmation, and disagreement does not prove that either product failed.

How to compare responsibly

• Compare the same date and first check that both products captured enough of the night.
• Read each value inside its maker's documented definition.
• Look for repetition instead of treating one dramatic night as a verdict.
• Do not infer airflow, oxygen, airway closure, clinical events, or diagnosis from the combination.