There’s a term / name for this method.
Emotional freedom technique (EFT)?
Emotional freedom technique (EFT)?
Seems it is for relieving emotional stress but i had only used it specifically to wake up at a specific time.
In EFT you're tapping on the end points of the meridian lines to send a kind of "reset pulse" to clear emotional issues. (At least that's the concept.)
To set a "wake up call" you (basicplus2) tap your head with your finger, but probably not on a meridian point, and you're not trying to clear an emotional issue. Also, some people tap their whole head on their pillow instead.