The Narrator goes to stay with Marla in her hotel to ensure that he won’t go to sleep and “become” Tyler. She suggests that they go bowling—they won’t be able to sleep, and therefore, Tyler won’t be able to do anything. The Narrator and Marla take “upper” pills and get on the bus, and the driver lets them ride for free—the Narrator realizes that Project Mayhem members are watching him at all times, keeping tabs on his behavior.
The space monkeys are watching the Narrator at all times, making sure that he doesn’t do anything else to sabotage Project Mayhem. Now that the Narrator knows about Tyler, he can try to control Tyler’s actions by deliberately not sleeping.