It is typically the result of working or active recreation, but also from boredom or disease, or simply because it is many hours ago (e.g. more than 16) that one has slept.
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... include the Amazon, the largest river in the world by volume, the Parana[?] with its impressive Iguaçu[?] falls, the Rio Negro, São Francisco[?], Xingu, Madeira and ...