it was hard to tell and I didnt actively do anything to encourage it

In my dream I was in work, at a desk and wondered how it was possible to have such a bad day and then I though one of the things on my desk I did yesterday. I then I noticed little things like it was in a desk that didnt match anything in the layout of my work. I then asked the person next to me if I was dreaming and they gave me a funny look. I then walked out the room into another room which now I think about it I have seen before in dreams but I dont know where or if it exists in the real world.
I entered another room there were afew noteworthy people from my old and new job and I said hello but didnt mention dreaming. I walked to the lifts and one set was filled with bin bags and the other lifts were weird like they were totally different and out of place. They were fixing in some new machines and I tried to use it to get out but it wouldnt let me. Suddenly I was in reception and there was the woman I see every night on my way home and I just walked with her as always.

What do you think was that it?
If I have done it once can I do it again?
Then my I woke up with my sister jumping on me