We went to France Yes only an hour away but I just changed the clock on my pump same as when the hour went on. How it effects you with tiredness I don’t or wish to know. (God I’m old) As a student working till 4am building models I needed more insulin but it depends on what you are doing. Also if you travel to somewhere hot it zapps your insulin dose. In France I decreased my basal by 0.1 units every hour to accommodate the less stress attitude on holiday. Alison would be a good person to ask.