This article is from the Bicycles FAQ, by Mike Iglesias with numerous contributions by others.
Jet lag is a problem, especially if you are coming from the West Coast which
means an 8-9 hour time difference. It is advised that you try to get on the
local time standard as soon as possible. If you arrive in Europe in the mornin
try to stay up and sleep when night comes to Europe rather than taking a nap
right away and then lying awake when it is dark outside.