1. Consciousness 15. latent content
2. circadian rhythm 16. REM rebound
3. REM sleep 17. hypnosis
4. alpha waves 18. posthypnotic suggestion
5. sleep 19. dissociation
6. hallucinations 20. psychoactive drugs
7. delta waves 21. tolerance
8. NREM sleep 22. withdrawal
9. insomnia 23. physical dependence
10. narcolepsy 24. psychological dependence
11. sleep apnea 25. addiction
12. night terrors 26. depressants
13. dream 27. barbiturates
14. manifest content