The Day Reconstruction Model (DRM) measures how people spend their time and how they emotionally experience the various activities and settings of their lives, combining features of time-budget measurement and experience sampling. It looks a little like this:

PEAK - Usually in the morning and is the ideal time to do your heavy analytical work.
TROUGH - Early afternoon, here I would advise you to do adminstrative work.
RECOVERY (also known as the rebound) - Late afternoon/early evening and is the perfect time to do your insightful work.

Negativity is on the rise in the afternoon and falls during the evening. Understanding this pattern will have a very direct impact on the work you do and also when you schedule important meetings.