celticdragonfly and I have been watching Buffy the Vampire Slayer an episode or two at a time. That's all we can manage in an evening between taking care of the kids and trying to keep the house under control. The last one had a really creepy monster, Der Kindestod. At bedtime we were discussing that the monster might show up in our nightmares.
Then it hit me: "This is how people do Buffy marathons and watch the whole series in a few weeks. Once you watch half a dozen eps you're too creeped out to sleep, so you might as well stay up and watch the rest."