I have those vivid ones as well. It's like living a second life. I know all about it but more often than not I meet a strange cast of characters. They say those people we see who we don't know are parts of ourselves, but there's no real way of proving that so I don't necessarily believe those experts.

The best way to remember is to remind yourself before you fall asleep. While you're dozing off, rather than thinking, just keep reminding yourself to remember the dreams. For some reason that works for me.