Well, I think it could have something to do with sleeping patterns
Some days I have it a lot, but then it's mostly when I'm stressed out, I think. I also have sleep paralysis: not being able to move instantly when I'm actually awake and lying in my bed. That's also annoying. Do you have that to?

Otherwise, you could mention it to a doctor. I heard it's just the left brain part communicating the sight to the right, so you get the signal twice and feel like it's happened before.