Editing Sleep and Circadian Rhythms (section)

== <span style="color: #FFFFFF;">Analyzing</span> ==
{| class="wikitable"
|+ Deep Sleep vs. REM Sleep
! Feature !! Deep Sleep (NREM 3) !! REM Sleep
|-
| Primary Function || Physical Repair / Brain Cleaning || Emotional Processing / Memory
|-
| Brain Activity || Very Low (Slow, large waves) || Very High (Looks like being awake)
|-
| Body State || Relaxed || Paralyzed (to prevent acting out dreams)
|-
| Timing || Mostly in the first half of the night || Mostly in the second half of the night
|}

**The Concept of "Sleep Debt"**: You cannot "catch up" on sleep. If you lose 2 hours of sleep on Monday, your brain doesn't just sleep 2 hours extra on Saturday. You miss out on the specific **REM** or **Deep Sleep** cycles that happen during those hours. Analyzing your "Sleep Architecture" is what reveals why you might feel "rested" but "irritable" or "clumsy."
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