Congratulations on your quit man. I'm 21 as well. Good decision to make now. As far as going to sleep earlier, I had that too. For me, it lasted probably a month that I was a lot more tired than usual. Honestly, part of it was that I had used tons of caffeine + nicotine for years to stay awake all night and work. Stupid idea on a number of levels. Guarantee that within a week after quitting you will start to feel loads healthier. For one thing, you're not putting dirt in your lip or huffing smoke from burning leaves, but also I remember just feeling healthier in general.
Keep posting roll, I quit with you today. One Day At A Time.