Ive learnt about eye tracking in college. There are devices + technology out there that can track your eye movements, ive seen a video where a disabled person is controlling a computer by moving there eyes, so in theory if you could make the devices more precise and look for smaller eye movements. And make a program where it tracks your eyemovements over a certain movement (over 10 moves in 30 seconds?) then activate something which informs you that you are dreaming i think its possible guys