Paul Kelley, a researcher at Oxford University’s Sleep & Circadian Neuroscience Institute, says workdays shouldn’t start until 10 a.m. because normal hours don’t line up with our circadian rhythms. “We cannot change our 24-hour rhythms,” he writes. “You cannot learn to get up at a certain time. Your body will be attuned to sunlight, and you’re not conscious of it because it reports to hypothalamus, not sight.” This is important: Possible side effects of prolonged sleep deprivation range from bad decisionmaking to obesity and Type 2 diabetes.
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