Fig. 3.

Predicted duration of social activity (per 3-h chunk) for individuals who engaged in social activity at least once. The duration is shown for three sleepiness levels at different times of day, split by type of day. Low sleepiness represents a KSS of two steps below the participant's own average. Average sleepiness is the mean sleepiness for each participant. High sleepiness represents a KSS of two steps above the participant’s own average. To increase ease of interpretability, predicted 30-min periods of social activity have been converted to predicted minutes of social activity. Error ribbons represent pointwise 95% CIs. Since predictions are made independent of participants, each line does not necessarily represent a day when any specific person is sleepy/average/alert but rather a prediction of the average length of social activity for a given 3-h time chunk and sleepiness level.