yes sometimes it will warn you of what will happened if you can interpret right.. its tricky sometimes.. it can be confusing too.. but if you can record what you can remember first thing you woke up.. you will be able to interpret the dreams.. but if you miss some details then it will be confusing and will not be able to make it out what it means?
I believe in dreams as I do have dreams all times.. It tell me what will happened in future.. Sometimes nightmares depend on if im worried or watched a horror movie.. LOL.. some foods sometimes can cause you to have weird or odd dreams.. thats why its not good to eat before you go to bed.. im fixing to go to bed as 
now.. LOL.. 
