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Time differential (min) for SWS periods derived by PSG and WHOOP. Data are presented as WHOOP time of day minus PSG time of day such that positive values indicate WHOOP-derived SWS periods occurred after PSG-derived SWS periods. Diamond marker represents mean bias ±95% confidence interval. Y-axis letters represent individual participants. Y-axis numerals represent individual participants’ sleep opportunities. min, minutes; PSG, polysomnography; SWS, slow-wave sleep.
