Ant writes "MSNBC reports that to help make up for sleep lost during marathon night flights, migratory birds take hundreds of powernaps during the day, each lasting only a few seconds, a new study suggests. Every autumn, Swainson's thrushes fly up to 3,000 miles from their breeding grounds in northern Canada and Alaska to winter in Central and South America. Come spring, the birds make the long trek back. The birds fly mostly at night and often for long hours at a time, leaving little time for sleep."
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