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Expectation fulfilment theory of dreaming
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Expectation fulfilment theory of dreaming : ウィキペディア英語版
Expectation fulfilment theory of dreaming
The expectation fulfilment theory of dreaming, proposed by psychologist Joe Griffin in 1993,〔Griffin, J and Tyrrell, I (2004) Dreaming Reality: How dreaming keeps us sane, or can drive us mad. Human Givens Publishing, East Sussex. ISBN 1-899398-36-8〕 posits that the prime function of dreams, during REM sleep, is to act out metaphorically non-discharged emotional arousals (expectations) that were not expressed during the previous day. It theorises that excessive worrying (regarded as unintentional misuse of the imagination) arouses the autonomic nervous system, which increases the need to dream during REM sleep. This deprives the individual of the refreshment of the mind and body brought about by regenerative slow-wave sleep.
==REM sleep==

Everyone has periods of rapid eye movement (REM) sleep every night, a phase lasting about 90 minutes.〔Aserinsky, . and Kleitman, N (1953). Regularly occurring periods of eye mobility and concomitant phenomena during sleep. Science, 18, 273–274.〕 This is when most dreaming occurs. Overall, REM sleep usually accounts for up to two hours of sleep time and most people can remember their dreams only if woken directly from REM sleep.〔Dement, W and Kleitman, N (1957). Cyclic variations in EEG during sleep and their relation to eye movements, body motility and dreaming. Electroencephalography and Clinical Neurophysiology, 9, 673–690.〕
It is known from laboratory studies of brain waves that, just before entering REM sleep and while in it, powerful electrical signals pass through the brain. On electroencephalogram recordings, these appear as spikes and are known as PGO spikes, after the initials of names of the structures of the brain they pass through. These same spikes occur during waking, when attention is drawn to a stimulus, the phenomenon being known as ‘the orientation response’. While sleeping, the spikes appear to represent the cue to dream.〔Morrison, A R (1983). A window on the sleeping brain. Scientific American, 248, 86–94.〕〔Morrison, A R and Reiner, P (1985). A Dissection of Paradoxical Sleep. D J McGinty.〕

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