Nocturnal beasts are a class of beasts which are known for sleeping in the day as opposed and active to night-time. Werewolves may belong to this category, since Hermione Granger remarked that their Defence Against the Dark Arts class was "not meant to start nocturnal beasts for weeks" when they began studying werewolves.
Professor Remus Lupin planned to review this category of beast with his third year class in mid-1993, although Professor Severus Snape started the unit early by teaching them about werewolves when substituting as Defence Against the Dark Arts teacher.
- Harry Potter and the Prisoner of Azkaban (film) (First mentioned)
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