Our sleep preferences are at least in part hereditary. Early risers have a body temperature peak around 3:30 p.m., while night owls are hottest around 8 p.m. Body temperature tends to be low in the morning, peaks in the late afternoon, and decreases until bedtime. Early birds have higher levels of cortisol in the morning, which may give them the perky edge. Hormones and body temperature also differ between the sleep groups. Evening types usually wake up right around their peak hour of sleepiness, so they may have high levels of melatonin and feel groggy. This means that morning people sleep through their peak hour of sleepiness, so they wake up feeling refreshed. Studies have indicated that self-described morning people have shorter circadian rhythms than self-identified night owls. The circadian rhythm, a 24.1-hour period that dictates the sleep-wake cycle, differs among people and can influence whether we are a night owl or a morning lark. Later on, over a strong cup of coffee, she’d apologize and we’d have a good laugh, only for the same routine to be repeated the following morning.Īs it turns out, our sleeping preferences weren’t just due to the fact that I responded better to the alarm. She’d grumble and complain sometimes she’d hurl insults like “Leave me alone,” or “I hate you,” or simply, “Die.” Offended, I’d sulk away, even more convinced of our impending tardiness. Convinced we would be late, I’d go in and give her some gentle nudging, which never went over well. I was up with the alarm clock and onto my morning routine, whereas she would stay in bed well past the ringing. I used to work with one of my roommates and getting up in the morning and heading to our job proved to be one of the most trying times in our friendship. The Truth About Night Owls and Morning People
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