According to the Buddhist teachings

According to the Buddhist teachings, we spend most of our time in this world in a kind of daydream. Within our "daydream" we are relating to what is going in our world but our sense of reality is heavily filtered by memories, habitual patterns of our mind, projections about the future etc. etc. etc. During the night, when we are "asleep," our story lines continue in the form of night dreams. - David Nichtern