I thought it was alarming but doing research online I found out that there's nothing to worry about it's just a relapse dream, it happens when you are trying to shut one habit in this case gambling too much.
It looks like you had so much fun on that night time gambling in your place that your subconscious wanted to recreate it in its own world . I think to have a dream one doesn't have to think of it too hard, it just the dream appears all of a sudden, a collection of your fun, frustrations, and fears.
I have dreamt that I am in a gambling environment playing cards and betting huge amounts of money against the bank, but it does not bring much alarm to me because I believe that it was just a dream and it is far from reality.