When I was a kid I read a book that said if before you go to sleep you think "I will wake up at Xam" (whatever time you want) then you wake up at exactly that time. Which is pretty weird! We can't do that when we're awake. It actually works, and I've never needed an alarm clock. For a few ultra-important days I used one, like catching a plane, but I was always awake before it went off.
When I was a kid I read a book that said if before you go to sleep you think "I will wake up at Xam" (whatever time you want) then you wake up at exactly that time. Which is pretty weird! We can't do that when we're awake. It actually works, and I've never needed an alarm clock. For a few ultra-important days I used one, like catching a plane, but I was always awake before it went off.
I have no idea how it works.