My Dreams

So I have insomnia which doesn’t help me especially when I have school the next day. When I finally get to sleep I hope that I’m lucky enough not dream because sometimes when I dream, I dream of people that are important to me dying or something going really bad. Some of the good dreams though are when I’m dream about something, these are one of the few times I remember the dream vividly and the dream comes true which really freaks me out. Can someone give me tips on handing things like what I named? Please and if you do thank you in advance.