Maria Konnikova presents research into “sleep inertia” – the reason why we’re all so miserable in the morning – and what can be done about it:
When [neuroscientist Kenneth] Wright asked a group of young adults to embark on a weeklong camping trip, he discovered a striking pattern: before the week was out, the negative sleep patterns that he’d previously observed disappeared. In the days leading up to the trip, he had noted that the subjects’ bodies would begin releasing the sleep hormone melatonin about two hours prior to sleep, around 10:30 P.M. A decrease in the hormone, on the other hand, took place after wake-up, around 8 A.M. After the camping trip, those patterns had changed significantly. Now the melatonin levels increased around sunset—and decreased just after sunrise, an average of fifty minutes before wake-up time. In other words, not only did the time outside, in the absence of artificial light and alarm clocks, make it easier for people to fall asleep, it made it easier for them to wake up: the subjects’ sleep rhythms would start preparing for wake-up just after sunrise, so that by the time they got up, they were far more awake than they would have otherwise been. The sleep inertia was largely gone.
Wright concluded that much of our early morning grogginess is a result of displaced melatonin—of the fact that, under current social-jetlag conditions, the hormone typically dissipates two hours after waking, as opposed to while we’re still asleep. If we could just synchronize our sleep more closely with natural light patterns, it would become far easier to wake up.
It wouldn’t be unprecedented. In the early nineteenth century, the United States had a hundred and forty-four separate time zones. Cities set their own local time, typically so that noon would correspond to the moment the sun reached its apex in the sky; when it was noon in Manhattan, it was five till in Philadelphia. But on November 18, 1883, the country settled on four standard time zones; railroads and interstate commerce had made the prior arrangement impractical. By 1884, the entire globe would be divided into twenty-four time zones. Reverting to hyperlocal time zones might seem like it could lead to a terrible loss of productivity. But who knows what could happen if people started work without a two-hour lag, during which their cognitive abilities are only shadows of their full selves?