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Standard deviation of daily sleep offset time in all days from actigraphy

sdsleepoffsettime5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep offset time is the end time of main sleep.

Standard deviation of daily sleep offset time in weekdays from actigraphy

sdsleepoffsettimewd5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep offset time is the end time of main sleep.

Standard deviation of daily sleep offset time in weekends from actigraphy

sdsleepoffsettimewe5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep offset time is the end time of main sleep.

Standard deviation of daily sleep offset time in workdays from actigraphy

sdsleepoffsettimewo5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep offset time is the end time of main sleep.

Standard deviation of the daily sleep onset time in all days from actigraphy

sdsleeponsettime5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep onset time is the start time of main sleep. This variable measures the within subject variability of sleep onset time.

Standard deviation of the daily sleep onset time in non-workdays from actigraphy

sdsleeponsettimenw5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep onset time is the start time of main sleep. This variable measures the within subject variability of sleep onset time.

Standard deviation of the daily sleep onset time in weekdays from actigraphy

sdsleeponsettimewd5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep onset time is the start time of main sleep. This variable measures the within subject variability of sleep onset time.

Standard deviation of the daily sleep onset time in weekends from actigraphy

sdsleeponsettimewe5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep onset time is the start time of main sleep. This variable measures the within subject variability of sleep onset time.

Standard deviation of the daily sleep onset time in workdays from actigraphy

sdsleeponsettimewo5 under Sleep Monitoring/Actigraphy in MESA variables

Sleep onset time is the start time of main sleep. This variable measures the within subject variability of sleep onset time.

Actigraphy QS: Data Collection End Time

timeend5 under Sleep Monitoring/Actigraphy in MESA variables

Actigraphy QS: Data Collection Start Time

timestart5 under Sleep Monitoring/Actigraphy in MESA variables

PSG QS: Participant Reported Time To Bed from type II polysomnography

lighoff5 under Sleep Monitoring/Polysomnography/Signal Quality in MESA variables

Clock time when the recording (study) ends from type II polysomnography

stendp5 under Sleep Monitoring/Polysomnography/Sleep Architecture in MESA variables

Clock time when the participant is out of bed or lights are on from type II polysomnography

stlonp5 under Sleep Monitoring/Polysomnography/Sleep Architecture in MESA variables

Conventionally, this variable would be called the end of time in bed (TIB).

Clock time when the participant is in bed or lights are out from type II polysomnography

stloutp5 under Sleep Monitoring/Polysomnography/Sleep Architecture in MESA variables

Conventionally, this variable would be called the start of time in bed (TIB).

Sleep onset time from type II polysomnography

stonsetp5 under Sleep Monitoring/Polysomnography/Sleep Architecture in MESA variables

Conventionally this variable would be called the start of total sleep time (TST)(i.e. total time spent in stage 1 or greater).

Clock time when the recording (study) begins from type II polysomnography

ststartp5 under Sleep Monitoring/Polysomnography/Sleep Architecture in MESA variables

Self-reported start time of the in-bed period on weekdays in 24-hour format

bedtmwkday5c under Sleep Questionnaires/Sleep Habits in MESA variables

Conventionally this variable would be called time to bed.Original question: 1. What time do you usually go to bed? a. On weekdays or work or school days?

Self-reported start time of the in-bed period on weekends in 24-hour format

bedtmwkend5c under Sleep Questionnaires/Sleep Habits in MESA variables

Conventionally this variable would be called time to bed.Original question: 1. What time do you usually go to bed? b. On weekends, or days off?

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

waketmwkday5c 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: a. On weekdays or work or school days?

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.