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Self-reported end time of the in-bed period on weekends in 24-hour format from survey questionnaires

waketmwkend5c under Sleep Questionnaires/Sleep Habits in MESA variables

Conventionally this variable would be called wake time.Original question: 2. What time do you usually wake up: b. On weekends, or days off?

Self-reported daily sleep duration on weekdays from survey questionnaires

wkdaysleepdur5c under Sleep Questionnaires/Sleep Habits in MESA variables

Self-reported daily sleep duration on weekends from survey questionnaires

wkendsleepdur5c under Sleep Questionnaires/Sleep Habits in MESA variables

Date and start time of the polysomnogram

apoe_edf_date under Administrative in APOE variables

Date and start time of the PSG as listed n the EDF file's header. Note: the start date has been deidentified to the first day of that month the PSG conducted.