Some people say that eating too much and a bad&painful indigestion may produce "good" nightmares... that might be a way to find inspiration or too many bad movies with even worse "good guys" making you think of true villains just to get ride of them...
Not sure those are good solutions but I'm dead-tired and my brain is even worse at conjuring up ideas than usual... sorry for the unhelpful help, don't mind me -_-