For years I had to report to work by 5:30 AM as a nurse. I naturally wake up every day at 4 am every morning no matter what time I go to bed at night, even after retiring. I am totally exhausted at 8 PM. People make fun of me going to bed early, but especially in the summer, it is wonderful to see the beautiful sunrises and get some work done in the cool of the early morning. I read for an hour when I first get up and get on the Cat Site. I have tried to change my schedule, but now that my cats are adjusted to it, they are good at telling me what time to get up and go to bed.