I have been having dreams that I forget until they come true. Why is this happening?

Hi 54lonewolf, last year I had the same problems. I kept seeing things and forgetting them the next day, but when i see it happening in front of me (in real life) i remember that it was the dream i saw. But the things i saw were a bit more weird and violent. One time i saw some students entering the school from the side window and anothe time i saw a groupfight on the schoolyard. Like you i asked advice too because i was weird to first not remember it and then suddenly have a deja-vu when it's happening. First of all prepare a notebook and a pen. and keep them next to where you sleep. Whenever you wake up write everything down that you remember from the dream. Also you should sleep more if you don't sleep enough or less if you sleep too much. the amount of sleep affects both your "imagination" that "creates" the dreams and your memories. To remember a recent observed subject better, one should sleep healthy and enough. Also I advice you to look into the meaning of your dreams. I know it sounds a bit religious but it should help you understand yourself even more so that you can make better decisions and live a better life.
Hope this'll help ya!
Kind regards,
Samuel Santiago Karf