recently i've been reading about AP.. and found that both of AP and Lucid Dream(WILDinduction) have to go to through sleep vibration..

how can we differ between Astral Projection and Lucid Dream?
cause i dont want an AP, i just want to LD...

and in addition, why people do LD instead of AP since in AP we really can travel AStral Plane instead of dream..?

sorry for bad english
thanks before..