[se]polar

, comparative studies using Polar data may analyze it based on mean and standard deviation (SD) within specific study populations to identify "good" versus "poor" sleepers. Formula for Sleep Efficiency

: Polar devices use physical activity monitoring (PAM) via internal accelerometers to distinguish between periods of rest and movement. [SE]Polar

Recent literature highlights both the utility and limitations of these metrics: , comparative studies using Polar data may analyze