Suprachiasmatic Nucleus (SCN)

🧩 What it actually is:

The Suprachiasmatic Nucleus (SCN) is a tiny region in the hypothalamus of the brain.
It’s located just above (“supra”) the optic chiasm — hence the name supra (above) + chiasmatic (related to the optic chiasm).

⚙️ Function: The Body’s Master Clock

The SCN is the main control center for your circadian rhythms — your body’s 24-hour biological clock.
It regulates things like:

• 🕑 Sleep and wake cycles

• 🌡️ Body temperature

• 🍽️ Hunger and hormone release

• 💡 Response to light and darkness

🌞 How it Works

1. Light enters your eyes → Photoreceptors send signals to the SCN.

2. The SCN interprets light signals and tells your brain whether it’s day or night.

3. It then controls the release of melatonin (the sleep hormone) through the pineal gland.

   • Bright light = less melatonin → you stay awake

   • Darkness = more melatonin → you feel sleepy

💤 Why It’s Important

If your SCN is disrupted (for example, from jet lag, night shifts, or too much screen time before bed), it can cause:

• Poor sleep

• Mood swings

• Fatigue

• Hormonal imbalance

🔧 How to Support Your SCN Naturally

1. Get morning sunlight (10–15 minutes) — resets your circadian rhythm.

2. Avoid bright screens at night — prevents melatonin suppression.

3. Sleep and wake at the same time daily.

4. Keep your room dark and cool for deeper sleep.

5. Eat at consistent times — digestion also follows circadian patterns.

🧬 Summary