I have found that it is very easy to go into a lucid dream while taking a nap in the afternoon. Usually, i take a nap in the daytime solely for the purpose of having a lucid dream! This is how it usually goes down. I'll be lying in my bed, starting to fall asleep. I'll open my eyes a little bit and ask myself "am I dreaming?" no... im just lying here in bed. A couple minutes later, I'll open my eyes again, and low and behold I'm dreaming! "Well, that was easy" I think to myself. Then proceed to fly out my bedroom window for an adventure. I don't why it works so well during the daytime. It seems I don't have to go through all the sleep stages; i can just go straight into a dream. Also, after I wake up from a seemingly long dream, only about a half hour has passed.