Just a couple of years before hitting the big 50.  Waking up at 0400 to be at work at 0600, it's just not as easy when I was in my 20s.  Never became a coffee drinker, nor jumped into the energy drink craze.  Always been a lifelong Pepsi drinker.  What did I just discover that will wake me up beyond description.
COKE!!!!!
I get a 1 liter bottle of coke from the c-store at 0500 and man, I don't get the drowsiness.