A young pregnant woman discovers that her perfect boyfriend may be a dangerous sleepwalker when she finds out of strange disappearances and murders taking place in the region.
"The Nightman Cometh" is the thirteenth and final episode of the fourth season of the American sitcom television series It's Always Sunny in Philadelphia. It is the 45th overall episode of the series and was written by co-creators Charlie Day, Glenn Howerton, and Rob McElhenney and directed by producer Matt Shakman. It originally aired on FX on November 20, 2008.