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Individual subject sleep efficiency data for the 5 pairs of female rhesus monkeys across the 7 d of sleep recording under paired (left panels) and nighttime separation (right panels) conditions. Dotted lines (70%) represent the sleep efficiency cut off for short compared with normal sleepers (≤70% = short sleeper). Blue dots represent monkeys housed at the University of Mississippi Medical Center; red dots represent monkeys housed at the Yerkes National Primate Research Center.
