Is it lucid because the dream repeats or because it is based on a past event

[horse]

Hi, I just turned fourty but in the last year or so, I have had the same dream occuring about 3 or 4 times. About once every few months. I need to give you a little background on this. When I was about 11 or 12 in school (an all boys school) school ground brawls were popular. Especially in the town where I went to school, and although I am not a trouble maker, I got dragged into a few, so you could say I had my share too Although we were all only kids, the brawls/fights could be serious enough But that was a long time ago, and now many years later I start to have dreams about one of the school fights that I was in. Everything in the dream is so realistic and exactly like how it was on the day Lately when I dream about this, I begin to realise during the dream, that this is only a dream, but based on a real past event. So I know that I am having a lucid dream! But my question is..... did my dream become lucid because I have had the same dream about 3 or 4 times, and my mind has got used to this and tells me it is lucid, or is my dream lucid because it is based on a true past event and my mind senses this and then knows that it is a lucid dream. Also any idea why after so many years it would start to come back now ? Thanks Horse