He says the solution is not to persuade teenagers to go to bed earlier. “The body’s natural rhythm is controlled by a particular kind of light,” says Kelley. “The eye contains cells that report to a part of the brain that 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