Everybody enjoys watching birds during the daytime, but what do they do at night, when they seem to disappear? Birds need sleep as much as we do, and they have evolved unique sleep habits to match their intensely energetic lifestyle. Instead of long stretches of obliviousness, they sleep in short bouts of several seconds or a few minutes, waking up to look around for danger, and then going back to sleep. To increase their vigilance, birds can sleep, shutting off only half their brain and one eye at a time, leaving them able to respond instantly to any alarm. The social habits of sleeping birds are also distinctive. Most are solitary, some sleep in pairs or families, while others gain advantages of warmth, safety, and even social needs like finding a mate, by joining in flocks, not to mention guidance on where to get breakfast the next day.

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