I have proven to myself beyond reasonable doubt that I dream about future events; although usually they are trivial matters. An example is a situation where I might be embarassed, chastized for showing up late for work, or what have you.
I don't expect anyone to take that at face value, after all, I have only proven it to myself, it would be difficult to prove it to anyone else, so I would not blame anyone for scoffing, considering that from their perspective I'm just 'some guy who claims to have proven it to himself'. If anyone is curious why I believe that I have proven this to myself I could probaby be persuaded to write a few paragraphs on the subject, but I don't want to spam out the thread.
In any case, I suspect that many, possibly most, people have this ability//trait/gift/whatever you call it.