Across
- 3. Overpowering urge to sleep
- 6. Caused by high levels of stress induced insomnia (Kenneth Parks)
- 8. Causes the person to be alert, energetic (caffeine, nicotine)
- 10. Alters perception, thoughts, feelings (MDMA, LSD)
Down
- 1. Physical or psychological dependence, or both
- 2. Causes drowsiness, sleep, and death (alcohol, opiates)
- 4. Altered state of consciousness
- 5. Waves that are not synchronous
- 7. Increasing amounts for the same effect
- 9. Waves that are synchronous