Well i did experience once lucid were one of my eyes was half shut and it was really annoying, but after stabilization everythin went back to normality. Stabilization is something that is very important yet very delicate in lucid dreaming, you need this to extend your time in the dream and have it as crisp and detailed as posible. Here is a great tutorial on how to stabilize a dream succesfully Dream Stabilization and Clarity Tutorial - Lucid Dreaming - Dream Views

Summary of the tutorial if you dont whanna read the whole thing is that basicly, remain calm and extend your both hands in front of your eyes and watch them with as much detail as posible for a minute or half a minute and in the meanwhile scream "ANCHOR LUCIDITY NOW!" and then after about 30secs-1 minute look up and your dream should be fully stabilized.

Good luck happy dreaming!