How do I set a voice memo as an alarm sound (iPhone 6 iOS 10.2.1)?

So I've been trying to have a lucid dream recently and read online about a technique (FILD technique) I could do but that requires me waking up at night so for that I've set an alarm at night but the thing is, my alarm goes off, I turn it off and because I'm so exhausted I literally forget what I have to do and go straight back to sleep. So I've decided that my alarm sound should be me saying "lucid dream" or something like that so I don't forget. But the thing is, I have no idea how to turn a voice memo into an alarm sound and all those online descriptions don't help.
I have an iPhone 6 running on iOS 10.2.1 and a MacBook Pro running on MacOS Sierra (version 10.12.2).

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