Worked the night shift (11-7) at Children's Medical Center in the ER as an ambulance driver paramedic during my college years. Whole different reality out there after the sun goes down.
I'm trying to cut down on caffeine personally, I feel like I'm very slow getting up in the morning. Then again you have to expect that on a Monday I suppose...
Caffeine is on the bottom of the list of things to cut from my life.