1. Minute-by-Minute Sleep Data: A SAS Macro to Create Summary Sleep Variables
Laura Grau, MPH

2. Introduction Wearable monitors Variables of interest Physical activity
Sleep
Variables of interest
Lying down (0,1)
Sleep (0,1)
Date/time

3. It is not that simple

4. What is continuous nighttime sleep?
Sleep patterns are SO different both within a person and between people
Examples:
Naps before bed
Fragmentations
Weekdays vs weekends

5. Define times of: lying down, fall asleep, wake up, and get up
95%
Raw data
Valid data
Correct
variables
Daytime
Nighttime
Nighttime
Define times of: lying down, fall asleep, wake up, and get up
Time in Bed (TIB): Defined as the sum total of individual minutes between the time the person laid down and the time they got out of bed
Total Sleep Time (TST): Defined as the sum total of individual minutes between the time the person fell asleep and the time they woke up
Wake After Sleep Onset (WASO): Defined as the sum total of individual minutes where sleep=0 between the time the person fell asleep and the time they woke up
Final Wake Time (FWT): Defined as the time between the person woke up and got out of bed
Sleep Efficiency (SE): Defined as TST/TIB
By day
By week

6. Validation