You should know that only practicing RCs and questioning if you're dreaming during the times you see a dream sign or something weird, will not work too effectively. You should include RCs and awareness during ordinary activities too, because sometimes in dreams you won't be aware enough to see oddities in the first place (that's often how it goes; first you become conscious and then use dream signs you see, or RCs, as a confirmation). Also, continue to supplement your techniques with a WBTB!
I have tried that, as well as the WBTB technique. It didn't work, and apart from this, it took me about one hour to return to sleep. As for, reality checks, I do them about five (or more) times a day.