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Plot of the logarithm of the ratio of REM sleep time to total sleep time per day, ln(R), versus the logarithm of body size, ln(M), in kilograms. The slope computed by using OLS regression is −6e−3 (P = 0.74; n = 61, 95% CI: −0.04, 0.03). The average value for R is 0.17. Note that the 95% CI for the slope is narrow and includes zero. The large outlier on the right side of the plot corresponds to the pilot whale (G. scammoni), a marine mammal.
