27.7%, t = 2.68, p < 0.05) in migrating birds; drowsiness also increased during the dark phase, but this did not reach statistical significance (12.9% vs. 8.1%, t = 1.73, p > 0.1).
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Migratory sleeplessness in the white-crowned sparrow (Zonotrichia leucophrys gambelii).
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