You may have noticed that sometimes dealing with all the tasks and issues at hand takes only a couple of hours, while other times you are barely making any progress at all. Clearly, it would be a mistake not to factor in individual aspects, such as your mood and the way you are feeling at the time. But in most cases high productivity has to do with periods of peak brain power. We are most productive when we manage to work during our peak hours, while being unable to remain as focused and productive during our energy troughs. So, how to determine your most active hours and take full advantage of them?