It seems that when I listen to music while going to bed, I tend to have a larger chance of having a lucid dream.
And the music somewhat affects my dream. Like if I listen to something really heavy, my dreams are "dark."
And if I listen to something lighter, I have happier dreams.
One thing I noticed is, if I listen to Journey, my dreams have ponies in them. But they're always G1 or G2 ponies.
Weird.