I believe that sometimes we should not take what we dreamed about gambling serious because a dream comes base on what you have at heart before you sleep.
But sometimes dreams happen in reality whether in the games or in other areas of life, I think we know the dream story of Joseph in the bible.
Regards to having games in dream, it does happen too but I don't think it does often and sometimes it is not clear enough but you only have to analyse the way it was shown to you in that dream before you can finally arrive at the real numbers, although some happen like it was given in the dream.
Yes I have seen some people give testimonies of how they got games revealed to them in the dream, and some refuse to gamble it because of doubt but at the end it is real numbers, this happens is football betting. So getting revelation of games in the dream is still possible but may not be frequent.
Those things we see in our dream is imagination, do you know that if you are not thinking of something else you will not eventually see it in a dream, some people dream base its what they have in mind and some people dream base on imagination, so whatever you are thinking so much most sure manifest in your dream because it has already be stored to your heart and when you are resting it will manifest as if you are in a real life and when you wake you think that those things you see in your dream angel review it to you, that is your imagination and something that have being bothering you for long time, for example, if you dream of something of different things 10 times, are you telling all of the dreams do come to reality, the answer is No, because not even two of the dream will happen to life, so let us not conclude that whatever you dream concerning gambling can give you wining in life time.