| A | B |
|---|
| Consciousness | an individual’s state of awareness, including a person’s feelings, sensations, ideas, and perceptions |
| REM sleep | a stage of sleep characterized by rapid movements, a high level of brain activity, a deep relaxation of the muscles, and dreaming behind closed eyelids |
| Circadian rhythm | a regular sequence of biological processes such as temperature and sleep that occurs every 24 hours |
| Insomnia | a sleep disorder characterized by recurring problems in falling asleep or straying asleep |
| Sleep apnea | a sleep disorder in which a person stops breathing for intervals of 10 seconds or longer, wakes up briefly, resumes breathing, and returns to sleep |
| Narcolepsy | a conditions characterized by suddenly falling asleep or very sleepy during the day |
| Nightmares | unpleasant dreams that contain frightening and anxiety-producing images |
| Night terrors | sleep disruptions that occur during Stage IV of sleep, involving screaming, panic, or confusion that is seldom remembered |
| Sleepwalking | walking or carrying out behaviors while still asleep |
| Hypnosis | a state of consciousness resulting from a narrowed focus of attention and characterized by heightened suggestibility |
| Posthypnotic suggestion | a suggestion made during hypnosis about performing a particular behavior in response to a predetermined cue that influences the participant’s behavior afterward |
| Biofeedback | the process of learning to control bodily states by monitoring the states to be controlled |
| Meditation | a systematic narrowing of attention on an image, thought, bodily process, or external object with the goal of clearing one’s mind and producing relaxation |
| Psychoactive drugs | chemicals that affect the nervous system and result in altered consciousness or awareness, influence sensations and perceptions, and modify moods and cognitive processes |
| Marijuana | the dried leaves of flowers of Indian hemp (Cannabis Sativa), that produce an altered state of consciousness when smoked or ingested |
| Hallucinations | a false sensory perception that has no direct external cause |
| Hallucinogens | drug that often produce hallucinations |
| LSD- (lysergic acid diethylamide | an extremely potent psychedelic drug that produces hallucinations |
