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ahh sleeping.
the first thing you have to overcome is the idea that animals only sleep in one block, like humans. while this is the case of animals higher up in the food chain who can afford to, most animals don't. in fact, given the conditions, humans will actually prefer to take their sleep in two 4-5 hour blocks.
what most animals do is sleep in short burst, says 10 minutes long, throughout the day. birds are quite adept at this, hiding in a bush, taking a quick nap, then getting back to incesant tweeting. another action employed, as macheath said, is to sleep one hemisphere at a time.
ducks have been shown to do this, and be responsive as to which side of the brain they sleep at one time. aquatic mammals also do this, whales will sleep one hemisphere, so that the other is awake to send it up for air everyso often, and keep searching for food.
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