Lesson 19
How Melatonin Is Made
From Serotonin to Sleep
⏱ 0:39Audio Narration
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"Melatonin is often called the 'sleep hormone', but it’s actually a full member of the melanin family — 'Mela-tonin'."
Key Terms
- Pineal gland: A small, light-sensitive gland in the center of the brain.
- AANAT / ASMT: The two enzymes that turn serotonin into melatonin at night.
- Circadian rhythm: The internal 24-hour cycle that tells you when to wake and sleep.
- MC1R double hit: When a mutation reduces BOTH skin melanin AND pineal melatonin.
As darkness falls, your pineal gland uses two enzymes (AANAT and ASMT) to convert serotonin into melatonin. Melatonin is a powerhouse antioxidant that can cross the blood-brain barrier to protect your neurons while you sleep. But here is the MC1R connection: if your master switch is variant, you often produce less serotonin in your melanocytes AND less melatonin in your brain. This 'double hit' means your whole system has less antioxidant protection during the day and less deep-tissue cleanup at night.
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SEROTONIN
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MELATONIN
Key Takeaways
- ◈ Melatonin is built from serotonin in the pineal gland during darkness.
- ◈ It is one of the most powerful cellular protectors in the human body.
- ◈ MC1R variants can impact both daytime and nighttime protection systems.
Collapse Check — Reflection
Apply Your Intelligence
If melatonin is 'melanin for the night', are you giving your body enough darkness to build its shield?
Next: This system doesn't just help you sleep — it connects you to the architecture of time.