For example, if you’re a larkish lawyer drafting a brief, do your research and writing fairly early in the morning. If you’re an owlish software engineer, shift your less essential tasks to the morning and begin your most important ones in the late afternoon and into the evening. If you’re assembling a brainstorming group, go for the late afternoon since most of your team members are likely to be third birds. Once you know your type and task, it’s easier to figure out the time.