Start making a habit to question this reality throughout the day, if dreams are becoming like this. Find a reality check that works for you first of all. But don't simply just blindly do that throughout the day. Every so often, or when anything even slightly out of the ordinary happens, assume you've been in a very vivid dream this whole time. Really believe it. Then use the reality check to prove/disprove it.

If you habitually question the ordinary here, you'll do it in an ordinary dream as well.