Recently on The Upgrade we learned about the science of timing your life perfectly—from what times of day are best for certain activities and what periods in life are best for a fresh start. But at the heart of timing your life well is knowing your chronotype. That is, knowing whether you’re a morning lark, a night owl, or as author Daniel Pink calls them—a “third bird” (i.e. someone in the middle of morning lark and night owl).
Source: Increase Your Productivity by Knowing Your Chronotype


