Really interesting and insightful piece!
Try this - immediately before closing your eyes say to yourself "I need to wake up in 15 minutes". In exactly 15 minutes you will feel a subtle mental nudge that you need to act upon and open your eyes. You can as easily ignore it, in which case you will go right back to sleep. YMMV, of course, but it works for many people and it is seriously amazing.
I do it like this: when laying in bed right before falling asleep I imagine a flip-card clock and the whole thing is spinning, just spinning, then I imagine it stopping suddenly on the time that I want to wakeup. The really cool part is when you wake up at exactly that time the next morning with NO alarm clocks!