Night terrors: - a sleep disorder characterized by high arousal and an appearance of being terrified, Insomnia: - sleep disorder in which a person has recurring problems in falling or staying asleep., Sleep apnea: - a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings., Narcolepsy: - a sleep disorder characterized by uncontrollable sleep attacks, Cognitive theory: - dream content reflects dreamers’ cognitive development – their knowledge and understanding., Stage 1: - This is a transitional stage between wakefulness and sleep, characterized by slow eye movements and a decrease in muscle tone., Stage 2: - During this stage, the individual is in a deeper state of sleep, characterized by a further decrease in muscle tone and a slowing of brain wave activity., Stage 3 and 4: - These stages are often combined and referred to as slow-wave sleep (SWS). They are characterized by an even deeper state of sleep, with very slow delta waves in the EEG., REM sleep - dreams, rapid eye movement,

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