Variation in Mood with Circadian Phase Stratified by Time Awake.

Survey scores were split into 4 categories of wake time: A), 6–12 hours (B), 12–18 hours (C), and 18–24 hours (D). Each category was binned by circadian phase and edges computed using the Freedman Diaconis Estimator [70]. Bin resolution and average number of samples per bin for each graph are as follows: 6.5° and 449 samples (A), 3.0° and 919 samples (B), 4.5° and 434 samples (C), and 40° and 50 samples (D). The average mood z score for each bin was plotted against the bin midpoint. Linear mixed models were fit to each category. Predictions using the fixed effects of each model were plotted.