TRT : Total Recording time
Definition : Duration of the recording.
TST : Total sleep time
Definition : Amount of sleep from lights out (recording starts) to lights on (recording ends).
SO : Sleep Onset
Definition : Sleep onset is defined as the first occurence of N2, N3, REM or 3 consecutives epochs of N1. (another definition can be found : Time from 'Lights out' to unequivocal sleep onset, under sleep onset aasm)
SOL : Sleep Onset Latency
Definition : Sleep onset latency is the duration from start recording to sleep onset.
WASO : Wake After Sleep Onset
Definition : Wakefulness between SO and last epoch of sleep.
WAKE : Wake duration
Definition : Minutes of time spent awake
N1 : Stage N1 duration
Definition : Minutes of N1 sleep
N2 : Stage N2 duration
Definition : Minutes of N2 sleep
N3 : Stage N3 duration
Definition : Minutes of N3 sleep
REM : Stage REM duration
Definition : Minutes of REM sleep
NREM : Stage N1+N2+N3 duration
Definition : Minutes of N1+N2+N3 sleep
%N1 : Proportion of TST in Stage N1
Definition : Percentage of TST spent in N1 sleep
%N2 : Proportion of TST in Stage N2
Definition : Percentage of TST spent in N2 sleep
%N3 : Proportion of TST in Stage N3
Definition : Percentage of TST spent in N3 sleep
%REM : Proportion of TST in Stage REM
Definition : Percentage of TST spent in REM sleep
%NREM : Proportion of TST in Stage N1+N2+N3
Definition : Percentage of TST spent in N1+N2+N3 sleep
SE : Sleep Efficiency
Definition : Portion of the TRT spent asleep.
PS : Persistent Sleep
Definition : persistent sleep is the first epoch of 10min of uninterrupted sleep.
LPS : Latency to persistent Sleep
Definition : Time from 'lights out' to the first epoch of persistent sleep. This metric is close to SOL.
LN2 : Latency to N2
Definition : Minutes from SO to first epoch N2
LN3 : Latency to N3
Definition : Minutes from SO to first epoch N3
LREM : Latency to REM
Definition : Minutes from SO to first epoch REM