I know that this is off topic but I had no idea where else to post this query.

Has anyone out there experienced that odd "Predetermined Autonomous Sleep Termination" thing (to coin a rather pretentious phrase). All I mean is where you think to yourself that you wish to wake at a paticular time and oddly enough you wake at that time - by the way I'm not talking about waking at the same time everyday due to a sleep pattern.
I noticed this ability in myself quite a time ago but in recent years I have lost all discipline so when I wake at my desired time I simply roll over and go back to sleep.