When we sleep, our brain produces a lot of random signals as it is sorting through and organizing information we dealt with during the day or in recent days. Sometimes this information can manifest itself in our dreams. Other times, our dreams have nothing to do with anything we've been thinking about and simply result from our brains making sense of the random signals they're producing.
Sometimes dreams can indicate something you're thinking about, but the extent to which they reveal some hidden truth about your thoughts only goes as far as whether or not you think it's true. Your dreams aren't "telling you" anything. And they're definitely not predicting the future.
