And then I will have different thoughts ... wake up until 8am. I had a quick wash and ran to school, but I was still late. After that, checking the time has become the first thing I do every morning.

For some people, waking up early just feels natural. Carla Finley is a baker in Brooklyn, N.Y., who starts her day at 5 or 6 a.m. Finley is what we would call a morning person. "Sometimes it's ...