Not sure how "scientific" this is. Long time ago, I read somewhere that you are more likely to remember REM dreams if they occur during a time that you are sleeping outside of your "NORMAL" sleep routine. So REM dreams are more likely to be remembered if you Start taking naps, as opposed to regularly taking naps.
I guess the trick in this situation might be to mix it up a bit. Slightly vary your sleep patterns over time.
Bill Perry Financial Freedom and Practical Spirituality
Originally Posted by Erin Pavlina
I have lucid dreams more often during naps too.
I think partly that when you go to sleep at night it takes 90 minutes before you even get to REM. I think during naps you hit REM faster so you are closer to consciousness. Just a guess though. If anyone has a more scientific explanation I'm all ears.