The circadian rhythm (biological clock) is set of biological and mental processes established during 24 hours by a living thing following the light and dark periods of a day. According to circadian rhythm, some people are productive in the morning, others at the midday or in the evening. To determine the times of the day when you are the most productive, you should answer the following questions:
- What is the time of the day when you feel the most energetic and focused? (You may find that there are several periods in one day.)
- When do you not have other compulsory activities, for example school, sports practice etc.?
There is a test which can determine (using a questionnaire with 19 questions) your circadian rhythm, so the time of the day (morning, afternoon, evening) when you are the most productive.
This test can be used as an aid to determine your highest-energy periods during the day, but cannot be used as the sole measure of intellectual productivity as it can be influenced by several factors (age, gender, stress, etc.).