Sara Mednick

The body has four different rhythms that help it function, one of which is circadian. Our circadian rhythms essentially tell us when to wake up and wind down. In addition, it’s thought there are four chronotypes, or different circadian types, that are influenced by everything from genetics and environment to sex and age. These chronotypes “play into whether you are more or less affected by the time of day issues,” said Sara Mednick, PhD, professor of cognitive sciences at the School of Social Sciences at the University of California Irvine, and author of “The Power of the Downstate.”

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