thanks for the reply. Hmmm I think I do need to get in the habbit of doing reality checks.
I also remember, whilst starting to feel heavy, feeling like I was underwater as I imagined I was in a swimming pool alone. Every time I went under the water my hearing started to muffle and my body felt pressure, and when I surfaced my head felt free and my body's pressure went. I also decided to have a walk around my dreamscape to help go lucid and I was walking down the middle of it and I met a little girl called Lucy who I ran with, brushing my hands again the trunks of the trees and feeling the bark. Lucy then stopped and waved as I ran on. Then I decided to lie down on the grass, which I could feel on my body even tho I could still feel my body on my sofa.
I found this a really fun and new experience, as I was still fully consious and I know I wasn't lucid. I'm guessing my body was shutting down and my imgination was coming very vivid and real.