Abstract
A conceptual framework using the psychoanalytic model has been presented to describe the REM/non-REM phenomenon. Waking life and sleeping life have been compared in terms of ego control and ego regression. The REM/non-REM cycle has been presented as representative of an archaic periodic form of functioning, the REM bursts suggesting peaks of psychic energy. The conceptual framework has been examined ontogenetically and phylogenetically, and psychoanalytic theory has been examined in the light of the neurophysiological findings. Finally, several models have been reviewed regarding the function or functions of the REM/non-REM cycle.
