On Wednesday night, I dreamt that a female colleague of mine had become my dentist. As she tried to inject my gums with anaesthetic, I fought her off with words to the effect of, "Get Off! You don't know anything about dentistry!"
Yesterday, I bumped into the same colleague and told her about my dream. It freaked her out a bit. Not, as you might suppose, because some weird bloke she hardly knows was having dreams about her, but because, for many years, it turns out, she was absolutely fascinated by dentistry and wanted to be a dentist.
Coincidence? I think so.
I bet that made you feel a bit down in the mouth!