http://padmasambhavagururinpoche.com/instructions-on-dreaming/ "Dreaming is induced by latent predispositions, so regard all daytime appearances as being like a dream and like an illusion. Acquire penetrating insight according to the statement in the Perfection of Wisdom, “All phenomena are like a dream and like an illusion.” In particular, it is crucial to practice the instructions on daytime appearances and the illusory body. At this time, powerfully imagine that your environment, city, house, companions, conversations, and all activities are a dream; and even say out loud “This is a dream.” "