Editing Sleep and Circadian Rhythms (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Sleep''' — A naturally recurring state of mind and body characterized by altered consciousness and inhibited sensory activity.
* '''Circadian Rhythm''' — The 24-hour internal clock that cycles between sleepiness and alertness.
* '''Suprachiasmatic Nucleus (SCN)''' — The "Master Clock" in the hypothalamus that regulates circadian rhythms using light signals.
* '''Melatonin''' — The "Vampire Hormone"; it is released by the pineal gland in response to darkness to prepare the body for sleep.
* '''Adenosine''' — A chemical that builds up in the brain the longer you are awake, creating "Sleep Pressure."
* '''Caffeine''' — A drug that blocks Adenosine receptors, temporarily hiding the feeling of sleepiness.
* '''REM (Rapid Eye Movement) Sleep''' — The stage of sleep characterized by intense brain activity, dreaming, and muscle paralysis.
* '''NREM (Non-REM) Sleep''' — The stages of sleep ranging from light (Stage 1) to "Deep Sleep" (Stage 3).
* '''Deep Sleep (Slow Wave Sleep)''' — The most restorative stage of sleep where physical repair and "brain cleaning" happen.
* '''Sleep Cycle''' — The ~90-minute period during which you move through NREM and REM sleep.
* '''Insomnia''' — Difficulty falling or staying asleep.
* '''Sleep Apnea''' — A disorder where breathing repeatedly stops and starts during sleep.
* '''Chronotype''' — An individual's natural inclination with regard to the times of day when they prefer to sleep or be active (e.g., "Early Bird" or "Night Owl").
* '''Blue Light''' — High-energy light (from sun or screens) that suppresses melatonin and tricks the brain into thinking it's daytime.
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