It's one of those things where you smack yourself in the head and say "duh!" when you realize it.
Are you staying hydrated and eating fairly quickly after waking up?
Me, I'd been waking earlier but in a haze the last few days... then I water/food/coffee up, and good to go. It's obvious in retrospect, but I was losing a few hours of good thinking by eating late in the day. Making the same mistake? Try having some water and something quick to eat in the morning.