There is a phone line in dream plane of reality which opens up to subtle planes of reality, and spirits operating at subtle planes can use that phone line to make an incoming call but since we don’t any natural language interpreter over there. all you receive metaphors, signs and symbols and you need to pick those make a meaning out of it in a waking stage. The better you decode, the higher you get clarity on some of those actions which will play important role to shape your life. Also that phone line is very much damaged nowadays because participants of dream are overusing their senses specially sight, and taste. So there is no incoming signal for most of us.