Figure 6
Sleep onset as estimated by wrist-worn activity trackers. (A) Individual subject SOL estimates for the Sham control condition (white) and the phase-locked auditory stimulation condition (purple). The bracketed numbers below show the number of valid data logs (out of 20 subjects). (B) The across-night “weekly” average SOL. Individual subject trends across conditions are plotted using connecting lines between data points. Subjects whose average sleep onset latency decreased are connected with solid lines; subjects whose average weekly sleep onset times increased are connected with dashed lines. (C) Per-subject difference from Sham (no stimulation) weekly sleep onset latency estimates due to stimulation (Stim—Sham). Subjects with faster weekly sleep onset times have negative values. (D) Weekly standard deviation in subjects’ sleep onset times (in minutes). Standard deviations in sleep onset times were calculated from available data from the four nights of recorded actigraphy data for each of the two conditions. * indicates p < 0.05, *** indicates p < 0.001. Note: one (1) subject’s activity tracker suffered a technical failure and was not included in the actigraphy analysis.
