I discovered when I was in my late teens that given a week or two of the same daily alarm, my subconscious would eventually recognize the sound as my alarm and I'd get up, walk across the room, turn it off, go back to sleep and wake up an hour or two later with absolutely no recollection of turning it off. I eventually discovered that using my phone as an alarm, with my call ringtone as the alarm sound, was the only…
To turn off the alarm, I'd have to solve 3 problems like "2x5+14-6" without getting any wrong. I eventually got really good at doing math in my sleep apparently, because I overslept a few days after about a year of using it. Later finding that my alarm was in the solved state.
Now I use the mode that makes you physically shake the phone a certain number of times (and a certain amount of force) to turn off the alarm. I have it set so it takes about 20 seconds of vigorous shaking, and by the end of it I'm fairly awake.
I did the ringtone thing for a bit and it just made me really hate my ringtone. I would never hear my alarm and go "maybe someone is calling", but I would always hear my ringtone and go "Wtf, why is my alarm app...? oh..."