I was honestly never expecting to complete this task, because I seldom remember my dreams, let alone achieve lucidity. However, my sleep schedule has been slightly amiss lately, and I think that helped me out. I had a Dream Initiated Lucid Dream (DILD), which I think is an amusing enough acronym to include in this proof.
Here is what I wrote down in my journal seconds after I woke up:
I dreamed I was in the Harry Potter world and I was in the Order of the Phoenix. I was a lame little boy though [I'm a physically healthy girl in real life], rather like Tiny Tim. I and a few others went into hiding at Sirus Black's old house back in September. In December they found us. I was in the backyard that was surrounded by a dark tall wooden fence. The grass was a sickly green, and there was an old rusty swingset with three swings. The fence was supposed to give magical protection. I was following the others inside when Umbridge apparated out of nowhere. She forced me to drink a purple potion. "Now you've been bugged," she gloated. "We will hear everything you do. I'm telling you becauseyou are not permitted to tell anyone else what transpired here." She disappeared.
At this point I was nearly awake so I had more control over the dream than I would usually have. So I went to the sliding glass door my grandmother had just opened for me, and I whispered to her, "Nana, I've been bugged." She whispered back, "Okay. We'll take necessary precautions. Don't tell anyone else." I went back inside the house, hoping I would escape the Death Eaters' punishment, but it was too late. Umbridge's voice echoed inside my head: "I thought I told you not to tell anyone? Now you must experience a most horrible painful death. You are poisoned." With that I began vomiting all over the floor. That was the end of the dream. I woke up.