Table 2 Sleep variable definitions
From: The feasibility of using actigraphy to characterize sleep in Rett syndrome
Characteristic | Definition |
|---|---|
Total nighttime sleep (TNS) | Total sleep between sleep onset and offset once a person was in bed |
Total sleep time (TST) | The sum of total night sleep and daytime sleep |
Sleep onset latency (onset latency) | The time it takes to fall asleep from lights out |
Sleep efficiency | The percent of time in an interval that the person is sleeping, calculated as [time asleep/(total interval time––invalid time) × 100] |
Wake after sleep onset (WASO) | The amount of time a person spends awake after they initially fall asleep |
Total daytime sleep | The amount of time spent asleep when parents report a nap of at least 10Â min |