I usually wake up the same time every single day, between 5-6am. I've done so since I was at least 12 or 13, the time getting usually closer to the 5am mark as high school rolled around. I'm in college now (home on break, but getting ready to go back) and I still wake up in that time frame just about everyday. I don't have an alarm set, I don't have the t.v. on, I don't have anything that forces me awake at that time, I simply wake up.

The only difference is occasionally I'll wake up at precisely 3am (I've woken up literally at like 3am countless times, never 2 or 4 or any other time around there that I can remember, always 3) and sometimes I might sleep in until like 8. Generally though, and as the case was for this entire break home from college, I've woken up between 5-6am on my own without anything forcing me awake, it just happens.