Your chronotype is your body's built-in preference for when to sleep and when to think clearly, and it is largely genetic. Research shows you can shift your schedule by up to two hours using morning light and a consistent wake time, but you cannot swap clocks entirely.
The bigger win is scheduling around your peak window: hardest work during your biological peak, admin in your weak hours, a fixed wake time even if it is later than the influencers approve of, and gentle shifting of fifteen minutes per week if your job demands earlier mornings.
Find your pattern with the free two minute goob sleep quiz, then build your routine on your schedule, not someone else's.