I just had a level 4 inceptionized dream. It was crazy.
The first was me swapping out parts of my bed and moving it from bed room to garage to patio, and back to bed room. Then I was watching some Abe Lincoln thing with my ex-girlfriend and giving her a leg massage when (in the dream) I was awakened by 4 very loud sounds that sounded like gun shots. Now, in the first dream, I was at my house now. When I woke up, I was at my mom's house. I came down stairs to look outside to see if there were any dead people bleeding out in the streets. There wasn't. I went back up stairs and back to bed, which sent me into ANOTHER dream.
This one was a Seinfeldian episode with most of the members of the cast. The main idea was that George was helping Kramer with a girl (and eventually that switched). When it switched, Kramer charged George $38 and a month of cable for his services. But Kramer's girl had a bad habit of pounding her way through doors 4 times. After the dream ended, I woke up (in the dream) and went back down stairs to explain to my mom where I thought those sounds came from. I think proceeded to explain the whole dream I just had, which ended up being it's own dream that ended back at my house as I was telling ALL of the dreams as one big story with extra details added (like the last part being in black and white because the woman was a big mark for Universal horror, and included Larry David as a mad scientist, a cameo from Will Smith from 1995, and 3 of the weirdo neighbor women from Edward Scissor Hands).
I've had plenty of dreams with in a dream, or woke up and my next dream either referenced a previous one or continued it, but never have I had 4 in a row like that, even explaining a dream within a dream within a dream IN the dream. So many SWERVES.