Currently on Day 3 of my Europe Jetlag Cycle. Day 1 I have just arrived, am exhausted, and sleep 12 hours (usually 9 pm to 9 am). Day 2 I am rested and have insomnia. And Day 3 I sleep well but wake up before 6 local time.
The cycle ends the day before I go home, and then I have another week re-adjusting.