**Early Birds, Night Owls, & Thirdbirds** **Your chronotype determines is where the peak/trough take place in the day**. The chronotypes follow a left-skewed normal distribution. Roughly, 30% are early birds, 50% are "third birds", and 20% are night-owls. **The measuring method is to find the midpoint of your average night's sleep.** Early birds have a midpoint before 4am. Night owls have a midpoint after 6am. Most people fall in-between. Midpoints tend to be earlier in early and late life, and much later around the teenage, early 20's years. **** # More ## Source - [[When (book)]] ## Related - [[Midday Slump]] - [[Protect Sleep]]