SeattleMH, this is certainly odd. I can imagine how frustrating it is to have a 5am wake up call when it’s not needed. When this began did anything change on the phone? What software version do you have? To check go to Settings > General > About > Version
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Have you talked to apple about this? I am sure someone there should be able to help you with this. I know I would hate having an alarm go off when I didn't need to get up.