Every time I try to lucid dream, I can't remember my dreams... for like weeks. My dream recall is normally fairly good...

I've only remembered one lucid dream, which was when I wasn't trying to lucid dream. I remembered, in a dream, that if you look at a clock, look away and look back, if it says completely different times, then you are likely lucid dreaming (or your clock needs replacing :p ). So, I did that, and as soon as i realised i was dreaming I woke up.

Anyone know what the problem could be?