The circadian rhythm of early birds allows them to fall asleep earlier and therefore they’re more likely to complete their natural sleep cycle by the time the alarm goes off in the morning. People who are morning birds generally find it easier to wake up unaided while us night owls find it a lot harder. The first relates to diurnal preferences. While the ability to resist hitting the snooze button may just come down to self-control, there are two biological reasons why some of us are more inclined to do so. This means you miss out on the recovery benefits of consolidated sleep, and your ability to function effectively during the rest of the day may be impaired. The end result is that the last proportion of your sleep becomes highly fragmented. Except this time when your alarm goes off, if you’re in a deeper stage of sleep, it’s a lot harder to wake up. So when you hit snooze and fall back asleep, your sleep cycle starts from the beginning. This may lead to an increase in sleep inertia, the groggy feeling you have immediately upon waking, and often the inevitable snoozing cycle. When we use an alarm clock, we may be woken during the middle of a sleep cycle when our bodies have not had time to fully prepare us for waking. If we were to sleep naturally without that pesky alarm clock, these factors would allow our bodies to gradually prepare for waking. Shortly before waking, our sleep becomes lighter, our core body temperature rises and levels of hormones such as cortisol increase. Each time we fall asleep, sleep starts at the beginning of the cycle.
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