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In this excellent paper the dream-sleep cycle is defined and described: REMP sleep is distinguished from NREMP sleep, and the relationship between REMP sleep and dreaming is elaborated. A number of significant subjects pertaining
to the neurophysiology and psychology of dreaming and sleep are discussed: cardiovascular and respiratory changes in REMP and NREMP sleep; changes in muscle tone during the dream-sleep cycle; body movement during sleep; skin resistance and cerebral blood flow; cycles of penile erection associated with dreaming; research findings on the relationship of dreaming to REMPs; the NREM psychic content and the relation to the dream process; the interrelatedness of dreams of the same night; the relationship between REMs and dream content; and research on the depth of sleep, auditory arousal thresholds, and cognitive discrimination, including experimental work on animals.