Hi,

Visualisation is pretty much creating a mental image. Daydreaming is a series of mental images, similar to a dream which I guess takes on a life of its own. So I see visualization as controlled, while a daydream, still just being mental images, takes away your awareness of you sorroundings.

I don't know the dream/daydream mechanics so I can't tell you if it can give you a LD. To be lucid you must first enter an actual dream. This means that you have to be in REM sleep. If you manage to keep your visualization and overall awareness of the situation untill you reach this dream stage, then yes, it can help you become lucid.

There is probably some other way of using this as an induction technique, but that's the one I thought of right now. Perhaps visualizing (or fantasizing something), while understanding that the whole thing could be a dream, might reapear as a thought or an actual scenario after you fall asleep and pass into REM and thus a dream.

Good luck!