Put this clip at the point where a character gives up on staying up, then follow it with a few moments later to jump to the morning after, or end the edit there for a tired sign-off.
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This is a very short Donald Duck yawn, a sleepy open-beaked exhale in his familiar duck voice that lasts under half a second. It feels drowsy and gently funny, like tiredness taking over mid-sentence despite trying to stay awake. The clip comes from the cartoon Home Defense, released in 1943.