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Study was scored sleep/wake rather than with full sleep staging. This assessment is made by the scorer if there is not sufficient quality on EEG leads to do full R&K scoring. (0=no (full scoring); 1=yes (sleep/wake only)) Studies scored as sleep wake have all sleep stages scored using a default of Stage 2 and no arousals are scored.

Scorer assessed that sleep latency was reliable.

Sleep Heart Health Study Visit 2 (SHHS2)-These vary from 1 (poorest) to 5 (best) and reflect the proportion of sleep time the signals were useable.

Scorer observed periodic breathing for a period of at least 5 minutes during study.

Scorer observed periodic breathing for a period of at least 10 minutes during study.

Due to problems with EEG signals, arousals were ignored in scoring.

Data was lost at the beginning of sleep period because recording began after sleep onset.

Sleep latency will be considered reliable when a change in lights status (on/off) shows a clear transition (even if reversed- off to on) prior to the onset of sleep.

Data was lost at end of study due to unscorable signals.

Scorer noted that there was a problem scoring arousals.

Scorer observed periodic large breaths during study. When very large breaths (one or two) occur periodically (mostly on the inductance channels) between runs of fairly normal breaths for a duration of at least 10 minutes.

Scorer notes

Item from Insomnia Severity Index. (Morin CM, Insomnia, psychological assessment and management. Guilford Press, New York, 1993)[https://pubmed.ncbi.nlm.nih.gov/21532953/] Search for all ISI variables within this dataset