Sleep in continuously active dolphins

Yuske Sekiguchi (), Kazutoshi Arai and Shiro Kohshima
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Yuske Sekiguchi: Research Center of Physical Fitness, Sports and Health, Toyohashi University of Technology, 1-1 Tempaku Toyohashi-city
Kazutoshi Arai: Kamogawa Sea World, 1464 Higashicho Kamogawa-city
Shiro Kohshima: Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 2-12-1-W3-43 Oookayama Meguro-Ku

Nature, 2006, vol. 441, issue 7096, E9-E10

Abstract: Asleep afloat Mammals generally need more rest or sleep in the period just after birth than later in life. So a report in Nature a year ago raised eyebrows: killer-whale and bottlenose-dolphin neonates and their mothers showed little or no typical sleep behaviour for the first postpartum month, remaining mobile for 24 hours a day. This work suggested that sleep behaviour may not have the suspected developmental and life-sustaining functions, and has given rise to an interesting online discussion. Two teams raise the issue of sleep-like behaviour that may complicate matters, though definitions aside, these young mammals do seem to be remarkably active for extended periods.

Date: 2006
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DOI: 10.1038/nature04898

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