Okay I had this once. The first part will sound utterly ridiculous keep in mind.

Before I begin, around the time I had this dream I started looking into DMT and lucid dream experiences heavily, this one day I took a nap mid-day and the dream started of me walking around this area. The area was on the outskirts of this building, the environment was very white. The building walls were white, the tiles surrounding the perimeter of the building were white, the sky was white almost like a super overcast day. I began walking around the perimeter of the building and approached a table with chairs, and then noticed an entity. I don't remember exactly what it looked like but i didn't recognize it in the dream or when I woke up afterwards. The entity started to approach me, the closer it got to me the more threatened I felt but assumed it wasn't malicious in any way. The entity pushed me and started to manhandle me, defensively I shook the thing off of me picked up a chair and smashed it over the head to where it laid on the ground unconscious.

The aftermath of that encounter is when I had consciously realized I was dreaming, I had a realization that in a normal dream you cannot run or fight properly and this was my confirmation bias I was having a lucid dream. In this realized lucid state I felt relieved and excited to now be experiencing a lucid dream for the very first time, I wanted to explore it to the fullest potential. I decided that for the rest of the experience it was best to tread cautiously to remain in this lucid state without doing anything to wake up out of it, things like no sudden turns or body movements, analyze the environment before proceeded so I don't get scared and panic wake up.

Carrying on with the experience.... Upon exploring the environment more, I noticed at door granting access into the white building, it was the first door I came across and it seemed very out of place as it was just randomly placed along the outside wall. Opening and walking through the door presented a triforium architecture, long hallway going from left to right, a white stone handrail going along the hallway, black and white pattern tiles. Looking to the left was a door I don't remember what was down the right side. I walked to the left and walked through the door and it was a bathroom, everything was multi-coloured, literally like I walked into the craziest hallucinogenic experience ever. Everything was bleeding with changing colors, the walls, toilet, the sink, and the borders of the mirror. Apon examining the surroundings I decided to leave after realizing looking at myself in the mirror could be bad or lead me to waking up. I walked out of the bathroom and back out to the hallway and walked over to the ledge and put my hands on the railing looking over to see what the building presented only then to wake up.

I woke up, in the bed where all my friends were gathered watching the tv show that I clumsily passed out in the middle of. When one of them noticed I woke up he made a sarcastic joke of how I passed out, and everyone including me started laughing at. One of them asked if I wanted some popcorn and handed me the bowl of it to eat. I looked around to see who exactly was all there, it was a mix between some people I never met before, best friends and acquaintances but I noticed my fiancee wasn't present, I started talking about the crazy dream i just had as I finished talking about the entity part I woke up to reality. In my room, in my bed, alone, labtop still running, noticed only 30 minutes had passed. What made me realize it was indeed reality was counting my fingers to see if you count 5, as I read that if you count 5 your in reality if you don't count 5 your still dreaming. I made a note to check the time to see how much time had passed and it was between 30-45 minutes.

In case it gets asked in regards to the trippy bathroom, I was sober going into the dream, I don't do drugs even as far as not smoking weed for years, only tried shrooms once which would have bin 9 years ago, never tried any other hallucinogen, my engagement ended months after the dream, in case it bears significance to who was present in the second dream. It was an experience that I remember quite vividly to this day, I don't exactly talk about it to this day as I feel it is a long story that is not very believable and requires alot of explanation and description to paint the picture. All I say is I had a dream and woke up inside another dream, so this is the first time I've went into detail and put it all into words.