858 166 Nights (#) 1171 299 Age (years) 49 (15.9) 47 (16.5) Sex (% female) 50 47 BMI (kg/m2) 29.7 (7.6) 26.8 (4.7) TST (minutes) 365 (76.2) 378 (60.7) Effic...
https://www.apple.com/hk/en/healthcare/docs/site/Estimating_Sleep_Stages_from_Apple_Watch_Sept_2023.pdf