Table 1 Measures of objective sleep continuity and sleep architecture derived from polysomnography data
From: Assessing the daily stability of the cortisol awakening response in a controlled environment
Measure | Description |
|---|---|
Total sleep time (TST) | The number of minutes scored as N1, N2, N3 or REM sleep. |
Sleep onset latency (SOL) | The elapsed time from lights out to the first epoch classified as sleep. |
Number of awakenings (NWAK) | The number of stage wake occurrences. |
Wake after sleep onset (WASO) | Minutes scored as wake from the first epoch of sleep to lights on. |
Sleep efficiency (SE%) | Total sleep time (TST) as a percentage of total recording time (TRT) ((TST / TRT x 100) = SE%). |
Time in Wake, N1, N2, N3 and REM (%) | Time scored individually as N1, N2, N3 and REM sleep, as a percentage of total sleep time (TST). |
REM, N1, N2 and N3 latency (mins) | The elapsed time from lights out to the first epoch of stage REM, N1, N2 and N3 sleep in minutes. |