I fixed my 3 a.m. wake-ups and brain fog by syncing my sleep with the rising and setting of the sun, just like the Amish — doctors explain why this circadian living works

By Nicola Appleton, Jul 29, 2026

“Circadian means ‘around the day,’ and for humans and almost every other living thing on earth, it’s aligned with the sun and controls two of our most fundamental states of being — sleep and wake,” explains Dr. Alex Dimitriu, a doctor double-board certified in Psychiatry and Sleep Medicine. “At the core of the circadian system is sleep and wake,” says Dr. Dimitriu. “Sleepiness is reset by sleep, and builds up the more hours you are awake.”

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