I used this technique some years ago, I red it in one of Rudolf Steiner’s books. After a week, my dreams became very vivid, and I had my first lucid dream (at this point, I didnt know what LD’s were, so I searched the web and came to LD4All). I stopped with the technique, because it gave me a hard time falling asleep, because I woke up every time just before I fell asleep, because I realised ‘hey, i’m almost falling asleep now’ and woke up (this happened AFTER I used the technique and then tried to sleep: when first using this technique, I fell asleep during the exercise, but later I got better at it).
Note: I remember that the exercise had more effect when you speed it up, so think as fast as possible your day/week/etc back in reverse order.
(Excuse for my poor English. )