Lana is sleepwalking, and the others can't sleep.
While the other Louds go to sleep for first time at the truck (the events ocurr the same day as the previous episode), Lana can't do it. All the others sleep so quietly on their beds (or in Luna's case, the floor, because she didn't want to Luan wake her at midnight), but as Lana isn't used to sleep without her animals with her. If you ask me, the animals left out because it wasn't enough space at Lana's "room".
What she does is try to sleep. And she was lucky enough because she does it. But, sometime around 11pm, Lana gets out the bed -yet with closed eyes and snoring-, and directs to the bathroom. As the bathroom links with Lola's room, it causes she to awake. At seeing Lana, Lola nags her for having interrupted her beauty sleep. But Lana doesn't answer, simply walks to (as told by her) go to her bed. But Lola notices Lana is acting weird. At getting close to her, Lola is surprised by Lisa, who went out to get a glass of water. Lola asks what's happening with Lana. Lisa says Lana is sleepwalking, but no caring the situation, she musn't awake Lana.
Lola obeys, and she goes back to sleep. In the morning, Lana awakes in a mud puddle at the construction site. She almost gets punched, except Lincoln has retired her of the site. Lana asks how she got to that place. The same night, history repeats. And it repeats for all a week. Lincoln tells the rest that Lana is acting suspectfully at nights, so they decide record her to see what happens. When watching the disc, they notice Lana is a sleepwalker. As they tell her, Lana is worried about she bugged them. The others say they aren't bugged, and they will help her to cure her sleepwalking tendencies.
That night, the others put chain and a half on her, while she is lying on her bed. But, this not fixes the problems, because Lana managed to exit using a snake movement. The next night, they decide to put her on the fridge, but Lana eats all the food and manages to exit. As third way, Lana is tied on the roof, for avoiding she to move, but still, Lana is sleepwalking again. As final method, the siblings decide to risk, and they try all the possible so Lana CAN'T sleep. They turn on all the lights, Luna plays her guitar extra-loud, etc. For some reason, it works. And Lana doesn't sleepwalks anymore. It's the end? Yes indeedy.