You may have noticed that your productivity varies a lot. Sometimes dealing with all the tasks and issues at hand takes only a couple of hours, while other times you barely make any progress at all. Some of this can be explained by circumstances 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 we cannot be as focused and productive during our energy troughs. Knowing that, how can you determine your most active hours and take full advantage of them?