By Lauren Vinopal, 8/16/21
It would be unfair, though, to place all of the blame on the exercise. Like many ideas from the past, two sleep cycles isn’t one that’s aged well, Alex Dimitriu, a psychiatrist and sleep medicine doctor, tells me. “It takes our brain and body quite a while to wind down even once we’re asleep,” he says. “Having to repeat this wind down for a second, shorter phase of sleep, is too much overhead and time lost. The goal should be re-converging on a single phase of night-time sleep.”
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