Here's a different kind of dream interpretation. Several times lately, I've been awoken in the middle of the night -- like, 4 a.m. in the case of last night -- to a loud knocking sound, like someone's rappng on a door. It's startling and scary, because I assume someone is trying to get into my house or is already inside.
Yet then when I wait, or even get up and look around, nobody's there and the house is silent. I can only assume I dreamed the knocking. Yet it doesn't feel like part of a dream, it feels like something I actually heard that interrupted the dream.
I suppose one possible explanation is that one of my kids, whose bedrooms are on the floor above mine, got up to use the bathroom, and the knocking sound is actually them closing their door as they go back to bed.
I don't know if it would work to ask them, though, because they tend not to remember things like that the next day.