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There's a belief that its body is almost entirely composed of people's regrets. If you're suddenly overcome with wistfulness, there's probably a Drowtly above your head.

When exposed to a strong wind, a Drowtly's gaseous body quickly dwindles away. If your nose becomes itchy while you are sleeping, it's a sure sign that a Drowtly is standing above your pillow and trying to eat your dream through your nostrils.