This module explores the connection between circadian rhythms, stress physiology, gut-brain health, and endocrine function. It covers the HPA axis, cortisol and melatonin rhythms, effects of chronic stress and inflammation, and the role of the nervous system and gut-hormone axis. It also focuses on lifestyle strategies including sleep, nutrition, stress management, movement, and reducing exposure to endocrine disruptors to support hormonal and metabolic health. The module highlights how daily habits and environmental factors can influence hormonal signaling, metabolic balance, and overall well-being.