Prof. Deborah Skene, a leading chronobiologist at the University of Surrey, dives into the impact of circadian rhythms on our health as winter approaches. She discusses how our internal 'master clock' affects sleep, mood, and metabolism, revealing the surprising health risks of misalignment, particularly for night shift workers. Light, especially blue light, plays a crucial role in regulating our body clocks; Skene offers practical tips on maximizing morning light exposure while reducing evening brightness to combat winter blues and maintain our well-being.