Every time I've ever gone lucid, it will only last for what feels like a minute, before my vision disolves and turns into a light grey color, forcing me awake. I've been trying to stop from greying out so the dreams can last longer, but I can't - it's like watching water slip through my fingers. I'm not sure what's causing it, and I don't seem to get overly excited or anything that I've heard tends to force you awake.

Does anyone else have this problem? And does anyone know how to keep this from happening once I'm lucid?