You have to be very clear about what you want from the person dreaming of you. If you want someone to love you, it is very important that and not on anything else.
You can use a picture of the person you want to dream of you as your screensaver. This will help you to be more focused on your intentions.
If you focus on keeping your mind and energy calm, you can decide to visualize what you want. Your desire for manifestation can come with a crystal clear mind.