When we talk about making dreams come true, we tend to think in terms of specific things - like, "I'm dreaming of owning a sports car" - but things are goals, not dreams. Dreams are not one particular thing, but a whole life style. When we dream at night we don't see just one picture, we see a movie - a movie in which we're both the director and the star. By recognizing that our waking life is also a dream that we are creating, we are empowered to make it more aligned with our true wishes.
To live the life/movie of your dreams there are some very specific things you can do to make this happen. Particularly surround yourself with the appropriate scenery, costumes and props because just as what you surround yourself with during the day is likely to show up in your dreams at night, the things you surround yourself with will also attract more of the same in your waking life. We all know people who collect certain items. They probably didn't start out saying, "Oh I'm going to collect china frogs" but rather they probably happened to have one and a friend saw it and gave them another and then someone else saw them and added a third and before long everyone thinks this person wants frogs and so, even if they hate them, they keep getting more and more. Like attracts like. So what ever you're wanting your dream/movie to be, start manifesting it by surrounding yourself with images and symbols - physical props - of what you do want more of. If you are wanting to manifest more money, carry a silver dollar. If you are wanting to go to Hawaii, wear a paper lei and start living on Island Time. Whatever you have is drawing more of the same to you, so have in your head and in your hand only what you want to attract more of.
This works because the Universe is all about energy, frequency and vibration. If you want to manifest something, your energy has to be on the same frequency as what you wish to manifest. If you are depressed and want to manifest happiness you will not be drawn to happiness by focusing on negative thoughts. Plus to be drawn to happiness when you are down you need a dream that is bigger than your current circumstances. Your dream has to be bigger, stronger, more compelling, to pull you out of your funk. To make your vision a powerful magnet it must be a really big dream!
After all, a teeny tiny magnet doesn't have much pull and likewise a small dream wont keep your focus either. To draw you out of your old ruts and forward, the magnet - the dream - needs to be about 3x bigger than the life - the movie - you are acting in right now. In fact, your dream should be so big that you wont even be able to complete it in this lifetime - it should be so big you probably wont complete it for three lifetimes!