Well, it's not the dream magic exactly, it just most closely resembles that.

It'll interfere with 'foreign' mental influences. The....the closest metaphor I have is a TV thing, but you wouldn't understand that, would you? It'll be like...a bell is trying to be heard, but there's already another bell ringing, so it's hard to hear. On it's own, it wouldn't do it, but it's still another layer with the rest.