Internal Clock

Isn't it strange how our bodies get set into waking up at a certain time? My body for whatever reason decides every day that it want to wake up between 6 and 6:30. I have no reason to be awake then and have no desire to be since H will be waking up only a short 30-45 minutes later because of her internal clock. It doesn't matter when I go to bed or how many times I am up in the night, day after day I look at the clock and it says 6 something!! Maybe I should take it as a sign to start my day earlier, but instead I quickly shut my eyes tightly and wait to fall back to sleep for a brief 30 more minutes!