circadian

The more blue-white tones in the lighting, and the brighter it is, the more it helps support our circadian rhythms—the biological clocks inside our cells that drive our cycles of sleepiness and wakefulness.

"These things are not rocket science, but they're really fundamental to having a good, healthy circadian rhythm and a good healthy physiology through the winter."

These patterns hint at a close relationship between Alzheimer's progression and the circadian system -- the internal body clock that regulates sleep, wakefulness, and other daily biological cycles.

Horner noted that future studies could test whether reducing screen exposure in the hours before bedtime, when screen light may disrupt circadian rhythms and delay sleep onset, helps lower cardiometabolic risk.

The study, published in Nature Aging, explored how changes in the circadian system affect brain health and memory in mouse models of Alzheimer's disease.