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The goal of this study was to develop an objective quantitative method for representing the temporal organization of sleep in terms of the period and rhythmicity of REM sleep occurrences. Data on normative human sleep, already scored for stage REM and not stage REM, were subjected to a "binary autocorrelation." The mean period over 92 nights of sleep for 10 Ss was 101.5 rain and quite stable. Data is also presented on variability of the rhythm in terms of an "index of rhythmicity." Measures of temporal organization may prove to be as significant for sleep research as amount of the various sleep stages. [ABSTRACT FROM AUTHOR]