We've just returned to Switzerland, where we are currently living, after 3 weeks in Canada with family. My sons, 4 and 2, adjusted very quickly to the time difference when we arrived in Canada and now that we are back (a 6 hour time difference), my 4 year old is fine but my 2 year old! He has his usual early afternoon nap and goes to bed at his normal bedtime of 745pm and falls asleep no problem. But then wakes up around an hour later, ready to play! He won't go back to sleep till the early hours of the morning. Before this trip he'd slept through the night for many months. I'm trying to keep to our old routine but nothing is working, grateful for ANY tips!