I am not sure about the things I am going to ask were posted before, so please forgive me that I do not know it had been posted if it did.
Recently my time of sleep is getting longer and after I woke up, it's tiring. So I wonder could be the dreams I had recently increased awfully a lot. Right before that, about few years ago, where I haven't been introduced to the right way of buddhism, I heard from a "feng shui master" saying its because your soul flew away to travel and back to the body late. But after that, when I introduced to buddhism, I know there's no existence of "souls" in a person because its non-self. And the meditation of concentration helped me out to clear away dreams last time where I haven't stop meditation due to the exams.
So my questions are:
1. What was described about dreams by the suttas
2. Do dreams formed because of the wandering mind imagining things during sleep
or formed because of dreams are the projections of the daily activities, what you do, is what you dream
3. How to explain those dreams sometime turn out to be some kind of deja vu?