Light exposure, particularly blue-enriched light or specific wavelengths around 497 nm, modulates the hypothalamic suprachiasmatic nucleus and melatonin secretion, potentially interrupting the circadian rhythm disruptions associated with cluster headache. By stimulating intrinsically photosensitive retinal ganglion cells, light can alter neurotransmitter and hormonal patterns, which may help reset abnormal neurological patterns that trigger cluster headache episodes.