Slow wave sleep dreaming

Fifty volunteers slept two nonconsecutive nights in a sleep laboratory under electropolygraphic control. They were awakened for one report per night. Awakenings were made, in counterbalanced order, from slow wave sleep (SWS--stage 3-4 and stage 4) and rapid eye movement (REM) sleep. Following dream...

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Bibliographic Details
Published in:Sleep (New York, N.Y.) N.Y.), 1992-12, Vol.15 (6), p.562-566
Main Authors: CAVALLERO, C, CICOGNA, P, NATALE, V, OCCHIONERO, M, ZITO, A
Format: Article
Language:English
Subjects:
Activity levels. Psychomotricity
Adult
Biological and medical sciences
Dreams
Female
Free Association
Fundamental and applied biological sciences. Psychology
Humans
Male
Mental Recall
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Sleep Stages
Sleep, REM
Vigilance. Attention. Sleep
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Summary:Fifty volunteers slept two nonconsecutive nights in a sleep laboratory under electropolygraphic control. They were awakened for one report per night. Awakenings were made, in counterbalanced order, from slow wave sleep (SWS--stage 3-4 and stage 4) and rapid eye movement (REM) sleep. Following dream reporting, subjects were asked to identify memory sources of their dream imagery. Two independent judges reliably rated mentation reports for temporal units and for several content and structural dimensions. The same judges also categorized memory sources as autobiographical episodes, abstract self-references, or semantic knowledge. We found that REM reports were significantly longer than SWS reports. Minor content SWS-REM differences were also detected. Moreover, semantic knowledge was more frequently mentioned as a dream source for REM than for SWS dream reports. These findings are interpreted as supporting the hypothesis that dreaming is a continuous process that is not unique to REM sleep. Different levels of engagement of the cognitive system are responsible for the few SWS-REM differences that have been detected.
ISSN:0161-8105
1550-9109
DOI:10.1093/sleep/15.6.562