[LameRubberDucky]

Possibly but I don't think so in my case. I've worked 9:30 am - 6:30 pm or later for most of my 25 year career. Stayed up until 2 am every night pretty much.

I really did force the change for myself and it totally sucked going through it. I still don't just jump out of bed and feel instantly great. It takes 30 minutes or so to get fully awake. For example, this morning I so did not want to get up because I stayed up until 1 am. However, I did get up at 5:30 am anyway. It was awful and I'm dragging today. Caffeine helps as well.