The Science of Sleep

4. The almond-shaped part of the brain responsible for fear and emotional processing.
6. The "hunger hormone" that spikes when you are sleep-deprived.
7. A common sleep disorder characterized by difficulty falling or staying asleep.
8. The temporary inability to move muscles during REM sleep to prevent acting out dreams.
12. The "vampire hormone" released by the pineal gland in response to darkness.
14. Your genetically determined natural inclination to be an early bird or night owl.
16. A lifestyle involving little physical activity, often linked to poor sleep.
17. A state of weariness, fatigue, or lack of energy.
18. The brain structure that acts as a temporary storage site for new memories.

1. The 24-hour biological cycle that regulates sleep and wakefulness.
2. A disorder where breathing repeatedly stops and starts during sleep.
3. The slow, high-amplitude brain waves associated with deep restorative sleep.
4. The chemical that builds up in the brain during the day, creating "sleep pressure."
5. A fleeting, uncontrollable moment of zoning out or losing consciousness.
6. The waste clearance system that cleans the brain during deep sleep.
9. The stage of sleep associated with vivid dreaming and rapid eye movements.
10. The hormone that signals satiety or fullness to the brain.
11. The process of stabilizing a memory trace after initial acquisition.
13. A short period of sleep, typically taken during the day.
15. Sleep _______ refers to habits and practices that are conducive to sleeping well on a regular basis.