He says it’s not as simple as persuading teenagers to go to bed earlier. “The body’s natural rhythm is controlled by a particular kind of light,” says Kelley. “The eye doesn’t just contain rods and cones; it contains cells that then report to the suprachiasmatic nuclei in the hypothalamus.” This part of the brain controls our circadian rhythms over a 24-hour cycle. It’s like saying: ‘Why can’t you control your heartbeat?’”
What is one role of eye cells in humans?
They report on light to the part of the brain in charge of sleep rhythms They receive reports from the brain on how to process light They indirectly stabilize people’s heartbeats They filter out artificial light from reaching the brain