Gary BreckaHuman Biologist & Longevity Innovator

Why Your Morning Is Ruining Your Sleep

11 Apr 2026 · 1 min

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In this YouTube monologue, Gary Brecka explains how the body's circadian rhythm—its 24‑hour internal clock—relies on light exposure in the morning to set sleep‑wake patterns. He describes that when natural sunlight hits the eyes within the first hour after waking, the brain receives a signal that suppresses melatonin (the sleep hormone) and triggers cortisol production (the energy hormone). This single step initiates the day's physiological cascade, and roughly 12‑16 hours later the body begins producing melatonin again to facilitate falling asleep. The video emphasizes that missing or delaying this morning light exposure can disrupt the timing of melatonin release, thereby impairing nighttime sleep.

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Let's talk about the underrated secret. Your morning determines your night. The circadian rhythm is your body's internal clock. It runs on a 24-hour cycle and it controls your sleep-wake patterns. And the biggest trigger for setting that clock? Light. More specifically, natural sunlight in the morning. When your eyes register natural light within the first hour of waking, you send a signal to your brain to suppress melatonin, your sleep hormone, and start producing cortisol. Your energy hormone. This one step sets your entire day in motion, and 12 to 16 hours later, your body starts making melatonin again to help you fall asleep.