This happens to me within the first few seconds of a WILD (think I have only had those 5-6 times) as well as the first time I ever had a lucid. Think I actually became lucid because I got snapped back to bed while trying to claw my way across the floor (that and one of the walls of my room was missing and there was a ghost staring at me =P). Not that I am expecting this to happen now, but how I carry on is by engaging the senses and demand dream stabilisation and detail. It normally stops after a little while and allow me to carry on.