Ordinal Sleep Depth - Data and Code

This provides data and code to accompany the Ordinal Sleep Depth (OSD), a
data-driven continuous measure of sleep depth developed using deep learning.
In the manuscript, we evaluate OSD's correlation with arousal probability and
its association with age, sex, sleep-disordered breathing (SDB), and cognitive
impairment using 21,787 polysomnography recordings from 18,116 unique
patients. OSD shows a strong linear correlation with arousal probability
(Pearson's r = 0.994), slightly outperforming the Odds Ratio Product (ORP)
measure (r = 0.923). Both measures reflect expected decreases in sleep depth
with advancing age and demonstrate that females have significantly deeper
sleep than males. OSD more accurately captures sleep depth reductions
associated with SDB and increasing levels of cognitive impairment.