The Reawakening was a supernatural event that occurred in 1997, when the discipline of Dementation was returned to the Camarilla Malkavians. This undid the ritual of the Great Prank, which replaced Dementation with Dominate, soon after the Convention of Thorns.
Some explain the Reawakening by saying it was a consequence of Malkav himself, moving in his bodiless sleep. Others talk of an effort actively made by the antitribu to spread their maddening "infection". And there are even those who claim that whatever held Dementation at bay, it ceased to be during the Week of Nightmares that happened the same year.