FusionDex

Nidozee are nocturnal Pokémon, using their sensitive noses to sniff out the dreams of sleeping Pokémon within their territory. If they come across a sleeping Pokémon that they think is a rival, they will exude a poisonous gas that causes nightmares.

If your nose becomes itchy while you are sleeping, it's a sure sign that a Nidozee is standing above your pillow and trying to eat your dream through your nostrils. When it is with its friends or family, its barbs are tucked away to prevent injury.