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First inpatient sleep episode. Association between habitual bedtime duration (HBD) and sleep parameters during the first inpatient sleep episode (for which time in bed was equal to HBD). Each point represents a different volunteer. Regression lines are shown if the slope is significantly different from 0. NREM refers to non-rapid eye movement; TST, total sleep time; SWS, slow-wave sleep; REM, rapid eye movement.
