In order to avoid predators and the hot sun, many migratory birds choose to fly at night when they migrate  When they have to fly over some natural geographical barriers such as the Gulf of Mexico, they even fly endlessly for 24 hours  Like humans, long-term lack of sleep can make birds extremely tired and less flexible, which inevitably leads to greater risk when they take a break  However, a new study shows that migratory birds have a clever solution  The scientists observed seven captured Sven's night thrushes and found that the migratory birds that used to fly at night were not completely relaxed during the day and usually had one eye open
Brain waves also showed that only half of their brains were in a standard dormant state
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