Rágugliztam, és bizony vastagon kuruzslás:
"Experts say that while most trackers can in theory tell when a person is awake versus asleep, they are prone to mistakes. And as far as distinguishing sleep stages, trackers that include only an accelerometer as their sensor, can't do what they claim," said Hawley Montgomery-Downs, a sleep researcher and associate professor at West Virginia University, who has studied the accuracy of sleep trackers.
That's because although an accelerometer monitors your movement, "you move the same amount whether you're in deep sleep, or lighter stages of sleep," Montgomery-Downs said."
