Man I wish I could go back to my senior year and just stay there! Life was easy. I know all you highschoolers are saying "yah right" because I was saying the same thing. Trust me, enjoy your high school life because it won't last much longer and then you're on your own. For me it never really set in until about 2 years or so of full-time work I realized I would be doing this for the rest of my life until I retire. That's just life. Free time is a luxury that you won't always get. Jeez I feel like such an old fart talking like this.
Oh, and if you think my example is bad, there are people who have it way worse. I have friends who work two full-time jobs and go to school full-time. That's a total of 120 hours a week, you do the math. Suddenly, sleep sounds like a luxury too doesn't it? Saw a friend just last night who had been up for 35 hours and was eating "lunch" before going back to work for another 7 hours, and he's only got one job.