You snooze, you lose - with some sleep trackers

Wearable sleep tracking devices - from Fitbit to Apple Watch to never-heard-of brands stashed away in the electronics clearance bin - have infiltrated the market at a rapid pace in recent years. And like any consumer products, not all sleep trackers are created equal, according to neuroscientists.

source https://www.sciencedaily.com/releases/2021/02/210217151008.htm