Circadian Reset From Morning Light: Photobiology, SCN Pathways, and Evidence-Based Timing for Health
Circadian reset refers to the physiological realignment of the body’s internal timekeeping system to the external light–dark cycle. In humans, the central circadian pacemaker resides in the suprachiasmatic nucleus (SCN) of the hypothalamus. When appropriately timed light reaches the retina, it initiates neural signaling that shifts the phase of clock gene expression, coordinating daily rhythms… Read More »