How do you know you are not dreaming right now?

There is now way to know that I am not dreaming right now. Some might answer that dreams seem very faraway and hazy when one recall them, and since "real life" seems so vibrant and, well, real, then it must be real life. However, when one is dreaming, the "dreamworld" is probably just as real and only when one wakes up, the other world seems very hazy and dreamy, pun intended. The only difference is that in the real world, we find out facts that we didn't know before. Dreamworld is merely a simulation by the brain. Since in real life we find out many things that are both true and new to us, it can only be unreal if it is a massive simulation by computers (Matrix). And there is no way to find out intentionally. Another thing is that dreams are inconsistent - they don't continue about the same thing each succesive night (Sometimes I wish they did - they'd be easier to follow).