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Across 3. the limited capacity to process information that is under conscious control. 4. natural, marijuana-like substances produced by the body. 6. a diagnostic category that encompasses the variety of ways in which wakefulness and awareness might be comprised. 8. a sleep difficulty characterized by difficulty falling and staying asleep, as well as not feeling rested. 9. the need to consume increasing amounts of a drug to get the desired effect. 10. type of brain activity that dominates N3 sleep; higher energy than theta waves. 13. three biologically based dimensions of consciousness-activation, input, and mode. 14. substances that decrease or slow down central nervous system activity 16. state in which a patient shows signs of intentional behavior (such as visually tracking a person), but cannot communicate. 19. substances that create distorted perceptions of reality ranging from mild to extreme. 22. a heightened awareness of the present moment, whether of events in one's environment or in one's own mind. 24. the pattern of brain activity when one is awake; rapid, low-energy waves 25. a state of consciousness in which the eyes are closed and the person is unresponsive and unarousable. 26. the degree of alertness reflecting whether a person is awake or asleep. 27. the adverse effects people with physical dependence experience if they stop using a drug. 29. substances that activate the nervous system. 30. the ability to focus awareness on specific features in the environment while ignoring others. 34. a delay in reaction time when the colors of words on a test and their meaning differ. 35. the pattern of brain activity when one is relaxed and drowsy; slower, higher-energy waves than beta waves. 36. Freud's deeper, unconscious level of dreams; their meaning is found at this level. 37. practices that people use to calm the mind, stabilize concentration, focus attention, and enhance awareness of the present moment. 38. a state that occurs when a person walks around, speaks incoherently, and ultimately awakens, terrified, from sleep. 39. a pattern of brain activity during N1 sleep; slower, lower-energy waves than alpha waves.

Down 1. a bundle of nerves in the brainstem that are involved in wakefulness and the transportation between wakefulness and sleep. 2. an awareness of one's surroundings and of what's in one's mind at a given moment; includes aspects of being awake and aware. 3. a condition that results from habitual use or physical and psychological dependence on a substance. 5. the form of sleep with few eye movements, which are slow rather than fast. 7. images, thoughts, and feelings experienced during sleep. 11. a sleeping disorder characterized by brief pauses in breathing during sleep. 12. a sleep disorder characterized by excessive daytime sleepiness and weakness in facial and limb muscles. 15. the ability to maintain focused awareness on a target or an idea. 17. the variations in physiological processes that cycle within approximately a 24-hour period, including the sleep-wake cycle 18. convincing sensory experiences that occur in the absence of an external stimulus. 20. naturally occurring or synthesized substances that, when ingested or otherwise taken into the body, reliably produce qualitative changes in conscious experience. 21. a state of minimal consciousness in which the eyes might be open, but the person is otherwise unresponsive. 23. quick movements of the eye that occur during sleep, thought to mark phases of dreaming. 28. Freud's surface level of dreams, recalled upon awaking. 30. a sleep difficulty characterized by activities occurring during non-REM sleep that usually occur when one is awake, such as walking and eating. 31. a sleep difficulty characterized by sleeping more than 10 hours a day for 2 weeks or more; includes an urge to nap during inappropriate times. 32. monitoring of information from the environment and from one's own thoughts. 33. a state characterized by focused attention, suggestibility, absorption, lack of voluntary control over behavior, and suspension of critical faculties; occurs when instructed by someone trained in hypnosis; may be therapeutic.