Regarding those who wind up asleep for the Nightmare on Lunatia Street prompts, for someone who has magic related to dreams and the like, would there be any particular pings to those who are affected? Also, would anything happen if someone made an attempt to change any of their dreams/visions so that they're not being haunted?

Edit: Also, a question I forgot - regarding Aracht, if someone were to search all locations for information about them - or potentially any other creatures related to the Seven Sins, would there be anything to be found?