Figure 2
From: The effects of physical activity on sleep architecture and mood in naturalistic environments
Sleep architecture characteristics and relationship to mood. (a) Hypnogram from a representative participant. Black lines indicate sleep stages; vertical gray lines indicate 90-min increments; red horizontal lines indicate REM periods. (b) Histogram of all REM period (REMP) onset times for all participants. Characteristic peaks are observed at 90, 180 and 270 min for the onset of the first three REM periods, corresponding to ultradian cycles. (c) Histogram of the average REM/NREM ratio in the first 180 min of sleep for all participants. (d) Simultaneous multiple regression models predicting morning stress (top) and energy (bottom) from sleep and physical activity. Dots indicate estimated coefficients and error bars indicate 95% confidence intervals. (e) Standard error plots showing inverse relationship between REM-L and morning stress (top) and REM/NREM ratio and morning energy (bottom). Dots represent average values of REM-L and REM/NREM ratios, respectively, and error bars represent standard errors of the mean. (f) Between-person correlations between the average REM/NREM ratio and average morning stress (top) and average morning energy (bottom).
