This document discusses time management and using your energy efficiently. It explains that it is important to understand your circadian rhythms and whether you are a morning or night person when scheduling tasks. Morning persons should schedule tasks requiring focus in the early hours, while night persons should schedule these tasks later in the day. It provides time ranges for optimal cognitive tasks, short term memory tasks, long term memory tasks, and manual dexterity based on being a morning or night person. An example is given of a project manager who was not scheduling tasks according to his biological clock as a morning person.