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Drowsey's egg can cure the common cold if eaten. However, eating it also causes a week of vivid and bizarre dreams about Pokémon, so many people prefer to heal on their own rather than accept the present that Drowsey offers.

If it senses sadness with its fluffy fur, a Drowsey will rush over to the sad person, however far away, to share an egg of happiness that brings a smile to any face. If your nose becomes itchy while you are sleeping, it's a sure sign that a Drowsey is standing above your pillow and trying to eat your dream through your nostrils.