I have been going to bed around 10pm each night, giving myself close to 8 hours of sleep. I can't tell you what a difference this has made in my life!
Before, I would get to bed on an average time of 10:45. I always got up on time faithfully, but for some reason, early rising did not make me go to bed early like I had always heard. Before, I was not as much sleepy as "dragging" all of the time. This also led to feeling overwhelmed easily and snacking more frequently since I would think I needed something to "perk me up." Not to mention my former caffeine addiction. (Okay, to be honest, I still have some addiction, but I drink less than one cup of coffee in a whole day and I don't need it first thing in the morning.)
I can definitely say that I won't have any trouble continuing this habit after the Habit Challenge is over. I feel so much better...it is enough motivation to get to bed on time. Everything is better when you are well-rested! (And you DO get more done!)