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This Concept Map, created with IHMC CmapTools, has information related to: Gerzina Ch 4 24, sleep disorders such as REM behavior disorder, psychoactive drugs categorized by hallucinogenics, alcohol defined as chemical resulting from fermentation or distillation of various kinds of vegetable matter, hypothalamus controls release of melatonin, stage 1 characterized by hypnic jerk, hallucinogenics such as LSD, caffeine defined as mild stimulant found in coffee, tea, and several other plant based substances, adaptive theory states sleep evolved to avoid predators, amphetamines such as benzedrine, depressants such as alcohol, opium defined as substance derived from the opium poppy from which all narcotic drugs are derived, REM characterized by REM rebound, LSD defined as powerful synthetic hallucinogen, stage 3 & 4 characterized by deep sleep, stage 2 characterized by body temperature drop, psychoactive drugs categorized by depressants, amphetamines defined as synthesized stimulants, REM rebound occurs with lack of REM sleep, hypothalamus controls release of serotonin, any significant loss of sleep results in irritability