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It's midnight, Yoyo, Gluglu and Bibou are not in bed, they're out playing acrobats! But is it safe to go out at this hour? Do they know that when the moon is round, strange creatures roam in the dark and growl? "Not even scared, not even scared!" scream Les Pyjamasques. But what is this beast? Les Pyjamasques fight the Grogarou that looks like a big nightmare and give small readers the feeling of being able to overcome their nocturnal anxieties.