I think I effectively switched from a night owl to an early bird by having something I _really_ wanted to do in the morning that was actually physical (martial arts classes).

I remember the exact day my body switched - I was going in the early morning and my body was not approving of my initiative. Every morning was hell - but then one morning early spring we had a training outside - sunrise, early leaves on the trees in the park, we all got quite sweaty some of the guys started to take our tops off and it looked like a scene from a martial arts movie. I remember thinking this looks so cool - we’re training like our forefather used to.

Next day I woke up exact time I needed no grogginess whatsoever. Have been an early bird ever since, almost 10 years now.