Answer: Hypothalamus
Answer: Sleep debt
Answer: Circadian
Answer: Light-dark exposure
Answer: Pituitary gland
Answer: Hypothalamus, Thalamus
Answer: Melatonin
Answer: Slow-wave sleep
Answer: Stage 3 and stage 4
Answer: Stage 2
Answer: Latent
Answer: Cataplexy
Answer: Central sleep apnea
Answer: Somnambulism
Answer: Tolerance
Answer: Dopamine
Answer: Psychological dependence
Answer: Serotonin
Answer: Hypnosis
Answer: Meditation
Answer: Pain management and Stress control
Answer: Meditation