Which sleep tracker do you recommend?

No specific sleep-tracker brand or model is recommended. Wearable sleep trackers can be useful, but their accuracy varies—especially for sleep-stage estimates—so treat the readings as approximate rather than definitive. 1 2

• Wearable sleep trackers can be effective, but their accuracy varies. They are improving, though current devices may not be accurate enough for diagnosing sleep disorders; one expert predicted future devices might reach the accuracy of a professional PSG sleep study and potentially receive FDA approval for diagnosis. 3