We wore the ScanWatch Nova every night for three weeks. Setup pairs through the Withings Health Mate app in about three minutes, and the morning sleep summary popped up on the phone before we’d even gotten out of bed. The sleep-stage data matched what we’d seen on an Oura Ring run in parallel for two of those weeks — REM and deep-sleep numbers were within about 8 percent of each other, which is close enough that you’d act on either one the same way.

Where the Nova actually pulls ahead is the respiratory screening. We ran the overnight breathing scan on three different nights, including one after a heavy meal and late wine. The watch flagged a “high” disturbance index on that night and a normal one on the others. Whether you’d want to take that to a doctor is your call — but as a heads-up that “something’s off tonight,” it’s the kind of signal a Fitbit or basic Garmin doesn’t give you.

Comfort overnight is the real test for any wrist-worn tracker, and the Nova did fine. The steel link bracelet swaps out for a rubber strap if you’re a stomach sleeper or you hate metal touching your wrist at night. We slept through, didn’t notice it, and that’s the highest praise you can give a sleep wearable.