This podcast episode delves into the intricate relationship between light, temperature, and circadian rhythms, exploring how they impact our sleep-wake cycles, metabolism, and overall well-being. It highlights the significance of balancing light exposure throughout the day, avoiding bright light at night, and aligning our body temperature rhythms with the natural day length for optimal circadian function. The episode also discusses the potential benefits and risks of nootropics, or “smart drugs,” and emphasizes the importance of thoughtful self-experimentation when exploring substances that affect neurotransmitters. Additionally, it explores the role of cold exposure in enhancing metabolism and stress mitigation, and discusses the interplay between diet, neuromodulators, and circadian rhythm. By understanding the complex interactions between these factors, we can optimize our sleep patterns, enhance our cognitive function, and improve our overall health and well-being.