Jocko posts a photo of his watch on Twitter every morning when he wakes up at 4:30 a.m. I am not getting up that early, but I’m now waking up at 6 a.m. every morning, including weekends, which has amped up my daily productivity significantly. Jocko’s Discipline Equals Freedom is the book that motivated this change for me.
https://www.amazon.com/Discipline-Equals-Freedom-Field-Manual/dp/1250156947