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Circadian rhythms

No lazing on sunny afternoons

In the laboratory, fruitflies rely on an internal clock to alternate activity with a midday nap and night-time sleep. Surprisingly, when outdoors, they follow temperature rather than the clock, and skip siestas. See Letter p.371

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Figure 1: Rest–activity rhythms in fruitflies.

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Correspondence to François Rouyer.

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Rouyer, F. No lazing on sunny afternoons. Nature 484, 325–326 (2012). https://doi.org/10.1038/484325a

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