I have had a similar nightmare only it's always a house I can't get out of, the thing that ive never understood was theres a morgue in the basement, and a body is always burning in the crematory. I don't know how else to describe it but the dream is layered, I think I'm awake then I'm still trapped in my dream, so by the time I wake up I have to get up to insure I'm not still dreaming. It always ends in me sweating like crazy and in a full fledged panic attack when I awake, I hate it & it's at least once a month.