Yökyöpeli

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"Yökyöpeli" is a Finnish word that is used to describe a person who is a night owl or someone who stays up late at night. It's a colloquial term that can be used in a lighthearted or informal manner to refer to someone who prefers being active or awake during the nighttime hours. The word combines "yö," which means "night," and "kyöpeli," which is a playful term for a bat, an animal that is active at night.