Alerted to strange happenings in Clayton Falls, Colorado, Bobby sends Sam and Dean to check it out. A spreeding car with no driver, a homeless man pursued by a massive Gila monster, a little boy attacked by uprooted trees-it all sounds like the stuff of nightmares. The brothers fight to survive a series of terrifying nighttimes, realizing that sometimes the nightmares don't go away-even when you're awake...