I had this, I'm not sure if you would say "lucid" dream a few weeks ago, the day school ended for the summer. I was really really tired so I went home and I lied down on my bed and I ended up looking at my ceiling and floating up through it, I thought I was having an astral projection so I kept flying up and I looked down and saw my house and my street, but I kept flying and it turned into this odd cityscape I didn't recognize and my vision sort of turned into a game of Sim City with weird isometric 3D graphics. I tried going into a building and in my dream it came up with a loading screen of sorts as if I was in a video game trying to enter the building. At this point, I stupidly mused to myself, "I don't think this is a dream... Well there's one way to find out." I woke myself up.