an alert cognitive state in which you are aware of yourself and your situation
rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur. Also known as paradoxical sleep, because the muscles are relaxed (except for minor twitches) but other body systems are active.
recurring problems in falling or staying asleep
a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings
a sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times
Anxiety-arousing dreams that lead to awakening, usually from REM sleep
a sleep disorder characterized by high arousal and an appearance of being terrified; unlike nightmares, night terrors occur during Stage 4 sleep, within two or three hours of falling asleep, and are seldom remembered
a phenomenon primarily occurring in non-REM sleep in which people walk while asleep
a social interaction in which one person suggests to another that certain perceptions, feelings, thoughts, or behaviors will spontaneously occur
A clinical technique used to help a person learn to relax by monitoring muscle tension, heart rate, brainwave activity, or other body activities.
the act of deep thinking or reflection
chemicals that affect the central nervous system and alter activity in the brain
false sensory experiences, such as seeing something in the absence of an external visual stimulus.
psychedelic ("mind-manifesting") drugs, such as LSD, that distort perceptions and evoke sensory images in the absence of sensory input