There are times of the day when you naturally work better than others.
Certain activities need full attention and a non-fatigued brain while other activities can be done on auto-pilot.
You definitely need to be fresh when you meet a new patient and also when you are doing technically tricky jobs.
You will find things run much better if you do thought-intensive work in the morning and labour-intensive work in the afternoon.
You will also find that things run much better if you delegate everything you possible can to your team.
You have limited processing capacity during any given day and using it up on non-essential tasks just doesn't make sense.