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Pearson correlation between performance and percent REM sleep amount. (A) The number of head entries significantly positively correlated with the REM sleep amount at 0–2 h (r = 0.75; p < 0.01) and 2–4 h (r = 0.96; p < 0.01) periods on the training day. (B) It also significantly correlated on the testing day, but only during the 2–4 h (r = 0.81; p < 0.01) period.
