Not all hours of the day are equal when it comes to productive work. (There may be some coffee infusion involved, but let’s put that aside for the moment.)
Some people are morning types who thrive on getting up early, jumping out of bed, and starting on work right away. Some people are night owls who struggle through the morning and daytime hours but produce quality work when burning the midnight oil. Then there are those who are better suited to a traditional 9-5 schedule, experiencing their own peaks and valleys throughout the work day.
https://www.recruiter.com/i/productivity-hack-how-to-find-your-most-productive-hours/