a dream without sleeping?

I couldn't fall asleep last night, yet somehow I have a memory of a dream.
the fact that I spent all night awake (maybe I slept 5 minutes.. I must have?) when usually I can fall asleep with ease,
I had real problems last night.

the dream was very unusual, a fenced off underground club with military humvees parked outside, everyone was wearing black dress, male and female alike, I walked in and a younger male said something like "WTF are you doing here", I kept walking further into it, when all of a sudden some angry woman just charges at me like a bull and pushes me outside where another different woman, dressed like a psychologist or secretary is waiting in one of the humvees and tells me to get in. we drive, she tells me some stuff then it ends and i'm back in my room.

HOW did this happen when I can't even remember falling asleep at all!

was it a microsleep? or a lucid dream?