: While general clinical standards often define "good" sleep efficiency as
Sleep Efficiency (SE) is a critical metric used to assess sleep quality. It is calculated as the ratio of total sleep time (TST) to the total time spent in bed, expressed as a percentage.
: In scientific studies, [SE]Polar is often compared against the "gold standard" of sleep measurement, Polysomnography (PSG) , to evaluate the accuracy of consumer-grade trackers.
