Fear of my alarm not waking me up or failing?

I understand waking up for school is important, or to get to your job, but I have a very vital role at my job on Saturday mornings. I need to open the gym. So if I don't get there, the gym will not open. So this causes my night of sleep the night before to be a combat mode of sleep. Constantly, in and out of sleep. Basically with one eye open. I just have a fear of my iPhone malfunctioning and not waking me up. Or the battery somehow draining over night. What to do?

I would just get a regular alarm clock and set it for 6am or whatever time, then as a backup use the iphone and tell siri "wake me at 6:15am. That way always have a backup at that point. Heck even the regular alarm clocks have a battery you can put it in that is used if the power ever goes out, so that has a backup already in it.

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