About getting up early in the morning

I have got some comments about not being able to do things in the afternoon and in the evening. I want to explain that it has almost nothing to do with physical energy. It has almost exclusively to do with mental energy. Therefore it has little to do with how many hours I have been sleeping the night before. I can get a lot done in the first part of the day even if I'm tired. Even If I sleep for nine hours of more I don't get things done after the middle of the day. Now I feel like writing something which is very important for me to express and that is that even if I can't explain this it does not mean I'm not right. But of course I'm willing to discuss these things with my friends. I can't understand this but I'm very sure about how I feel and how it is for me. And, as I said, even if I can't explain it, I'm right. I have to write this because some people say that things are not in a certain way if you cannot explain why and even if you sometimes can explain why, they don't understand anyway and then they continue not to accept what you're saying. I don't agree with that way of thinking. One more thing I would like to emphasize is that I don't wake up by the help of an alarm clock. I almost never do that. I hope that I have made myself clear now.