1. They could be HH, since it does not always results in vivid images, but also in abstracts shapes or lights while you're failing asleep, but it could also be some reaction to the light. Usually when I'm tired due lack of sleep or watching tv/being in the computer for long hours, I go to sleep and when I close my eyes I suffer from this "light show" until my eyes adapt to darkness.
2. Yes that's what you would call a DILD (Dream Inducted Lucid dream). Read more about it here. Basically while you dream, something or someone makes you suspicious about wether you are awake or not. As you keep performing this technique, which consists on questioning reality as often as possible, as well doing reality checks to make sure you are awake (or dreaming!), your awareness will increase to the point where your eye will catch inconsistencies in scenarios/behaviors and trigged lucidity. DILDs are a huge help for beginners, because in the long term, you'll become lucid, if you keep practicing methods like ADA (read about it here).
3. Dreams are made by a mixture of memories and life expectations/ schemes. For example, in those weeks where I am filled with work, I tend to dream with work. Or if I'm really eager to go to the cinema, I might dream with it. It depends a lot on the amount of focus you give to it, because residual memory determines that certain events which you gave a big importance to in the last days can easily slip into your sub conscious and appear in your dreams. So yes it's perfectly possible, they can often turn out to be your dream signs 
4. I'd say no. First of all, you dream several times per night, and they can be entirely different. It's possible to have re occurring dream yes, but you won't get the same dream (or even the same scenario/message) during a week, unless you're really anxious/stressed about something. Since memories organization is also a part of the dream's function, you're likely to find several scenarios each night The deal is, we don't know the dream's message in 99% of the cases I would say, so that information seems a bit off imo :s
If you want to read a book that has great information about lucid dreams, read "Exploring the World of Lucid Dreaming" by stephen LaBerg. He's one famous scientist in the area, and he developed his own technique called MILD, which is highly effective to choose what you want to dream with!
Good luck and post any more questions if you have them
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