Table 1 Objective Sleep Parameter Definitions
Sleep Parameter | Definition |
|---|---|
Bedtime | Time at which an individual started trying to fall asleep. This was pre-set based on sleep diary data and visual inspection of actigraphy data |
Rise time | Time of final awakening, after which the individual did not attempt to fall back asleep. This was pre-set based on sleep diary data and visual inspection of actigraphy data |
Time in Bed | The total number of minutes elapsed between bedtime and rise time |
Total Sleep Time (TST) | The total number of minutes scored as sleep |
Sleep Efficiency (SE) | Total sleep time divided by time in bed, expressed as a percentage |
Sleep Onset Latency (SOL) | The time elapsed between bedtime and the start of the sleep period (the first epoch of the first section of 5 consecutive minutes scored as sleep) |
Wake After Sleep Onset (WASO) | Time spent awake during time in bed after the start of the sleep period |
Total Sleep Time Variability | Coefficient of variation (standard deviation/mean) for total sleep time within each participant |
Time in Bed Variability | Coefficient of variation for time in bed within each participant |
Bedtime Variability | Individual standard deviation for bedtime across the 10-day period |
Rise time Variability | Individual standard deviation for rise time across the 10-day period |