Also: It is important to acknowledge that procrastination is something that everybody do from time to time. It's part of life, and unless it's chronic, we shouldn't make it into a big problem.
Another thing: Our brains did not evolve to solve abstract problems for 8+ hours a day. They evolved to solve small, practical problems in everyday life. We learn from early childhood to work hard, to concentrate, to get good grades. Less focus is on the importance of listening to the signals that the body sends us, e.g. about taking breaks. It is perfectly fine to feel tired, to feel like not doing anything. It's important to rest.
Another thing: Our brains did not evolve to solve abstract problems for 8+ hours a day. They evolved to solve small, practical problems in everyday life. We learn from early childhood to work hard, to concentrate, to get good grades. Less focus is on the importance of listening to the signals that the body sends us, e.g. about taking breaks. It is perfectly fine to feel tired, to feel like not doing anything. It's important to rest.