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.
If haven’t found out, I wholly recommend doing a sleep study if you can. It can shed some light on any obstacles you may be experiencing. I’ve never done one myself, but I know people who got enduring benefits from the insights of their studies.
I asked him why he would prescribe a stimulant so late in the day. His reply was simply "it's so you can think of one thing instead of all the things".
Worked for me.