Three types of cells help the brain tell day from night

LA JOLLA—Bright light at night interrupts the body’s normal day-night cycles, called circadian rhythms, and can trigger insomnia. In fact, circadian rhythms play a major role in health. Disrupted day-night cycles have even been linked to increased incidence of diseases like cancer, heart disease, obesity, depressive disorders and type 2 diabetes in people who work night shifts. Therefore, understanding how human eyes sense light could lead to “smart” lights that can prevent depression, foster sleep at night, and maintain healthy circadian rhythms.

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