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      Do Predators and Thermoregulation Influence Choice of Sleeping Sites and Sleeping Behavior in Azara’s Owl Monkeys (Aotus azarae azarae) in Northern Argentina?

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      International Journal of Primatology
      Springer Nature

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          Clues to the functions of mammalian sleep.

          The functions of mammalian sleep remain unclear. Most theories suggest a role for non-rapid eye movement (NREM) sleep in energy conservation and in nervous system recuperation. Theories of REM sleep have suggested a role for this state in periodic brain activation during sleep, in localized recuperative processes and in emotional regulation. Across mammals, the amount and nature of sleep are correlated with age, body size and ecological variables, such as whether the animals live in a terrestrial or an aquatic environment, their diet and the safety of their sleeping site. Sleep may be an efficient time for the completion of a number of functions, but variations in sleep expression indicate that these functions may differ across species.
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            Sleep viewed as a state of adaptive inactivity.

            Sleep is often viewed as a vulnerable state that is incompatible with behaviours that nourish and propagate species. This has led to the hypothesis that sleep has survived because it fulfills some universal, but as yet unknown, vital function. I propose that sleep is best understood as a variant of dormant states seen throughout the plant and animal kingdoms and that it is itself highly adaptive because it optimizes the timing and duration of behaviour. Current evidence indicates that ecological variables are the main determinants of sleep duration and intensity across species.
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              Sleeping under the risk of predation

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                Author and article information

                Journal
                International Journal of Primatology
                Int J Primatol
                Springer Nature
                0164-0291
                1573-8604
                February 2017
                January 4 2017
                February 2017
                : 38
                : 1
                : 80-99
                Article
                10.1007/s10764-016-9946-5
                a25d6cf6-3e85-485d-9c5b-a1c28fdcfa56
                © 2017

                http://www.springer.com/tdm

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