Insomnia is rarely a disorder of the bedroom alone. It sits at the intersection of stress physiology, circadian biology, gastrointestinal health, and systemic inflammation, and durable improvement often requires attention to each of these systems rather than reliance on a single hypnotic agent. A functional and integrative medicine framework, applied alongside rather than instead of evidence-based behavioral sleep medicine, offers a coherent way to organize this complexity and to individualize care for clients whose sleep has not responded to a purely symptomatic approach.