Your chronotype is your genetically influenced preference for when to sleep and when to be most alert. It is biology, not laziness or willpower.

Take it once. Your chronotype changes slowly with age — teenagers tend wolf-like, older adults trend toward lion. Recheck every few years.

One of four chronotypes: Lion (early riser), Bear (solar-aligned, most common ~50%), Wolf (night owl ~20%), or Dolphin (light sleeper). Each includes an optimal daily schedule.