Journeys through Spacetime

I become lucid. I am walking down a path, attempting to remember the TOTM. I remember the advanced task(spin and teleport somewhere random). I decide not to because I am attempting to walk somewhere.
I remember my goal to summon my Patronus. I yell Expecto Patronum! several times, but give up after a DC starts complaining about the noise. I decide to attempt it silently, and wisp by wisp, a 'thing' appears.

Spoiler for patronus:

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It appears just like the painting.
Suddenly, as I am still building it up, the dream go's grey. I panic, but quickly stabilise myself. I visualize the scene back, and soon I am back into the lucid dream. Phew! I however decide to not continue the patronus.