I am in Sevenum, Netherlands at the moment. I landed this morning at 7:00 AM local (Dusseldorf) and put in a full day. I only feel a little tired. I must be getting the hang of this. One of the tricks is to stay up after your first day is over. You have to move towards the new time zone.
I think the above article (and pasted as a image below) is important and a potenteous, and a bit scary. Especially, since it was written by the the founder of what facebook has become.