I do all of the above plus a good old-fashioned travel alarm clock.
Problem is I keep knocking the alarm clock to the floor. I reckon it's gonna conk out one day. Murphy's law dictates that this will happen on the morning I have a 4am start after checking in at 1am on an occasion where power cuts mean my phone didn't charge overnight so the phone alarm didn't go off as well.
Any suggestions, apart from carrying 2 travel alarm clocks?