Orangutans (Pongo spp.) have deeper, more efficient sleep than baboons (Papio papio) in captivity

American Journal of Physical Anthropology
David R Samson, Robert W Shumaker

Abstract

The nightly construction of arboreal sleeping platforms or "nests" has been observed among every great ape population studied to date. However, this behavior has never been reported in any other nonhuman primate and comparisons between ape and monkey sleep illuminate the link between sleeping substrates, positional behavior, and sleep efficiency. Here, we compare sleep depth and efficiency and night-time positional behavior between a large-bodied cercopithecoid (Papio papio) and a large-bodied hominoid (Pongo spp.) at the Indianapolis Zoo. We used infrared videography to assess nightly sleep and awake behavioral states, gross body movements, and postures in baboons (N = 45 nights) and orangutans (N = 128 nights). We calculated the total waking time, total sleep time, sleep fragmentation (the number of brief awakenings ≥2 min/h), sleep motor activity (number of motor activity bouts per hour), sleep efficiency (sleep duration/time in bed), and percentage of time spent in each posture. By every measure, orangutans experienced overall deeper, more efficient sleep. Baboons were more likely to sleep in guarded, upright positions (weight bearing on their ischial callosities) and never opted to use additional materials to augment sleep...Continue Reading

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Citations

Dec 15, 2015·Evolutionary Anthropology·David R Samson, Charles L Nunn
Jul 11, 2018·American Journal of Physical Anthropology·Barbara FruthFiona Stewart
Jul 11, 2018·American Journal of Physical Anthropology·David R SamsonCharles L Nunn
Dec 12, 2018·American Journal of Primatology·Laura R BidnerLynne A Isbell
Jul 11, 2019·Scientific Reports·Kathleen D ReinhardtK Anne-Isola Nekaris
Apr 12, 2019·Primates; Journal of Primatology·James R AndersonIris Weiche
Sep 14, 2021·American Journal of Primatology·Jackie Chappell, Susannah K S Thorpe

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