I find it helpful to shout out that I'm dreaming, or simply exclaim it (which is usually an automatic reaction whenever I become lucid). Say that you're dreaming a few times and just stay still for a moment, taking in the dream and trying to allow your consciousness to expand a bit more. Don't let DCs or anyone tell you that you're not dreaming; if this happens, say something like "don't fool me, I know you're not real."