Editing Sleep Circadian (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
Sleep is driven by two main systems: '''Process S''' (Pressure) and '''Process C''' (Clock).

'''1. Process S (The Pressure)''':
From the moment you wake up, '''Adenosine''' builds up in your brain like a debt. The more you have, the more you "need" to sleep. Sleep is the only way to "pay off" this debt and clear the adenosine.

'''2. Process C (The Clock)''':
The '''SCN''' uses light from your eyes to sync your body with the sun. It tells the body when to release '''Melatonin''' (at night) and '''Cortisol''' (in the morning).
* '''The Conflict''': If you stay up all night, your Adenosine (Pressure) is high, but when the sun comes up, your Clock (Process C) tells you to be awake. This is why you often feel a "second wind" in the morning even if you didn't sleep.

'''3. The Stages of Sleep''':
* '''NREM 1 & 2''': Light sleep; heart rate slows.
* '''NREM 3 (Deep)''': The "Janitor" phase. The brain's '''Glymphatic System''' opens up and flushes out metabolic waste (like beta-amyloid, which is linked to Alzheimer's).
* '''REM''': The "Psychologist" phase. The brain processes emotions and "integrates" new memories into your existing knowledge.
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