Hmm, fly back from Atlanta leaving at 20:00 EST (15:00 BST), sleep 3 hours on the plane getting back to the UK at 8:30 BST the next morning. Manage to stay awake all day and go to bed at 1:00 BST. Next day Wake up at 10:00 BST, go out, see friends, go to bed at 1:30 BST, can't sleep. Feel very awake but tired.
Get up, watch baseball (Sox stuff Yankees, woot), go back to bed at 5:30 BST. Birds shouting outside, fall asleep at 6:00 BST. Wake up at 10:30 BST, just catching end of Jeremy Kyle. Feel very tired but awake. Plan to stay awake all day.