Somnus Sleep Lab BETA (testing release only): overnight companion for sleep research. The Garmin watch app records raw beat-to-beat RR intervals from the optical HR sensor with on-watch buffering and reliable batch sync; the Android companion performs fully on-phone 4-class sleep staging (Wake/Light/Deep/REM, 30 s epochs, full probabilities) with a clean-room MCNN reimplementation of the published Topalidis/Schabus HRV method, plus hypnogram, signal-quality timeline and CSV/JSON export. No account, no cloud, no internet needed for analysis. Research reconstruction, not a medical device, not PSG validated on consumer hardware. Requires the Somnus Android companion app.

1.2.0 beta: initial testing release (overnight IBI capture, on-phone staging, hypnogram, export).