|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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The Drowsiness Draught was a potion whose fumes could be used to induce drowsiness, tiredness and fatigue in the drinker. The potion produced a light pinkish-purple steam.
A small bottle of this potion could be found on a table in the Gryffindor Common Room, and the smoke from the potion caused one girl to fall asleep while reading her book.