I tried a experiment with incense. I would always burn nag champa while playing civ IV on my computer and then I put it away for about two weeks. and then set it by my bed and when I woke up that night I lit the incense and fell back to sleep to see if I would dream about the Civ IV game and boy I did dream about the game pretty hard core.

I make my own incense from juniper leaf and sage that pick from the local flora in my area. I've tried using it to influence my dreams but the only time I got noticeable effect was with the nag champa and the Civ IV game.

I suppose someone could use this technique to induce a dream sighn scenario...hum.