I have to say that when you tour the world obviously the jetlags and different hours and ways of living and traveling a lot of hours in the plane and you wake up in the morning and you're not quite sure where you are and it is very tiring.
Have regular hours for work and play make each day both useful and pleasant and prove that you understand the worth of time by employing it well. Then youth will be delightful old age will bring few regrets and life will become a beautiful success.