This sounds a bit like Hypnagogic visions. Does this happen only in lucid dreams, or also in regular ones? If regular ones as well, how many of them are like this? How long have they been like this? Perhaps you aren't in getting to a deep enough sleep to fully experience your dreams? If this only happens in your lucid dreams, then you might only think you're halfway awake, but you're actually having a false awakening. Good luck!