The best thing to say is:
or even:
Serious reply:
The first one can actually be considered a mantra: even if it has a literal meaning, it's being used to ascertain a specific message with a psychological power.
In the end, it doesn't matter what you say: the exercise itself (and not the action!) is the most important part of the habit. It's not what you do, it's the fact that you're actually evaluating your state. In this perspective, repeating a sentence is actually counter-productive if it contributes to a mechanical way of reality checking. For me, reality checking is so much more about feeling.
Watch the first 6 seconds:
"I guess I thought the dream-space would be all about the visual, but it's more about the feeling."
And that's what you want to encourage with a reality check: you're seeking a disturbance on your state. Dreams can be extremely mundane at times, so you want the feeling that you're dreaming, regardless if your hand still has 5 fingers or the person next to you is telling you that you're dreaming.
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