Fig. 4
From: Numerical study of entrainment of the human circadian system and recovery by light treatment
Daily sleep times (black lines) and CBT minima (colored dots) during simulations of light treatment on non-seasonal affective disorder. The orexin level is increased on day 7 (indicated by an arrow), causing instability. Starting on day 14 (indicated by another arrow), morning light treatment of 10,000 lux for 1.5 h daily is administered and maintained during the times labeled yellow, which causes a gradual return to the normal phase