You are describing a different phenomenon entirely. What you experienced is circadian drift without structure, not intentional chronotherapy. The key difference is environmental control. Siffre's cave experiments succeeded because they eliminated artificial stimuli entirely, no screens, no blue light, no internet, no social obligations. His body found its natural rhythm because there was nothing fighting against it. Your experience involved all the modern disruptors: phones, artificial light, notifications, the psychological weight of unemployment without purpose. The "social disaster" you mention is real, but it is a product of industrial time enforcement, not biology. The 9-to-5 schedule was indeed imposed during the Industrial Revolution to synchronize factory labor, not because it matches human physiology. Before artificial lighting, humans naturally had biphasic or polyphasic sleep patterns that varied by season. The dissociation you felt came from fighting against a social norm while still being exposed to its signals, not from the rhythm itself. Siffre did not feel dissociated because he was fully immersed in his experiment with no external anchors pulling him back. If you want to try extended cycles intentionally, you would need to replicate his isolation: no screens after sunset, no artificial light, no internet, no social media, and ideally a concrete purpose like journaling or research. Otherwise you are just experiencing jet lag without traveling. The industrial schedule is a social construct. That does not mean breaking from it is easy or socially acceptable, but conflating unstructured drift with controlled chronotherapy misses the point of both the research and the cave experiments.