Internal Clock

I may have mentioned this before but I will consistently wake up minutes before my alarm clock is scheduled to go off. This morning I was sleeping in because I am going to work a little late tonight. I was in the middle of a dream this morning (I was up on the 100th floor of some building and wishing I had my camera) but the dream shifted to a phone ringing. In the dream, I reached to answer it and just before I did my alarm went off. When I woke up my body had already turned towards my clock. I snoozed several times and each time whatever dream I was having converted to something that approximated my alarm clock and brought me out of sleep.