I'm not yet sure if different endings have particular meanings. I think most of my dreams end abruptly, sometimes with my blinking my eyes; others seem to fade out for a second first; and I once even had a dream that ended with a very smooth, deliberate-looking crossfade effect from the last image I saw in the dream to the image I was actually seeing through my open eyes in real life.

This might be an interesting thing for me to start keeping track of--which dreams end with what effects--and try to see if there's a correlation with that and the content of the dream. I'll have to think about that.