I was in bed just before 7:30 last night after having been up for 20 hours. I slept for about 5 hours then on and off for 4 more.
Stopped in at Dunkin' Donuts on the way to work for a hot chocolate and a muffin. managed to work a full day without any problem. I did feel tired during my run this afternoon though. I had a bit of an headache from the flight and that was still there a little this morning, but it went away during the day and I'm fine now.