When I opened my eyes this morning it was past 10:00 AM. I didn't feel up to getting out of bed, so I stayed in it a while longer and finally got up at 10:33, feeling woozy and fuzzy.
I didn't understand why at first, but then it came to me. Yesterday I gave blood in the morning. Then in the evening I drank wine. It was pretty much the normal amount I drink when I have wine, but I suppose when you have less than the normal amount of blood, it's proportionately more alcohol than usual.