Sleeping feels like a pretty cut-and-dry process, but your body goes through a lot when you drift off into dreamland. There... moreSleeping feels like a pretty cut-and-dry process, but your body goes through a lot when you drift off into dreamland. There are multiple stages of sleep, and you cycle through them multiple times during the night. While experts recommend getting seven to nine hours of sleep every night, what matters most is how you move through the sleep cycles.