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From:

Some tricks that have been suggested for me, interspersed with ones I just made up and like the way they sound:

Imagine something specific and noticeable. For example, a bright red, square sign with a green circle in the middle, at the door to your workplace. Imagine it clearly and graphically each time you brush your teeth. If you ever see it in real life, you're dreaming.
"Get in the habit of asking yourself if you're dreaming" doesn't need to be random... just pick a reminder that sometimes appears inside dreams as well as out. For example, you might ask the question of yourself each time you can't find your way somewhere ;)
A friend of mine who grew up in Yaqui culture used to jump up and down a lot, trying to fly. When he was dreaming, it would usually work. I pointed out to him that this is harder to do as an adult.