Trying to set up an alarm in the morning on my iphone without it draining my battery?

So I want to set up my alarm clock in the morning when my phone is turned off but I know you can't do that so I was wondering what I can do so it won't drain my battery that's the only reason I want to turn off my phone off in the first place.

Every night I set my alarm clock and it only drains about 5-10%. Sorry, but other than that i'm not sure:/

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