Our primary aim is to understand the complex relationship between biological and psychological time, focusing on how circadian rhythms affect mood and time perception in mice. This research will uncover connections between mood states and our internal clocks, potentially leading to new treatments for mood disorders. We will work closely with chronobiologists, computational neuroscientists, and psychologists to study circadian rhythms, mood dysregulation, and time perception. Our systematic approach begins with examining light-dark cycle influences in mice, using bioluminescent reporters to correlate mood cycles with circadian clock phases in the brain. We will also study the effects of artificial seasonal lighting and jet lag on mood and motivation circuits. Our professional courses and internships will cover biological and psychological time, circadian rhythms and their impact on mood, and circadian experimental paradigms for mood dysregulation. The curriculum includes animal behavioral studies, molecular imaging, and experiments in varying light-dark conditions. The program structure starts with theoretical sessions on biological, psychological, and computational aspects of mood, followed by experiments with mice and tissue cultures. It ends with computational data analysis and group discussions. Our goal is to train new talent in cutting-edge experiments and explore the clinical benefits of circadian mood regulation and dysregulation.