As you live your life, aware of your environment and all of its contrasting components, a natural process of clarifying your personal preferences occurs. Sometimes these preferences are so fully conscious that you speak of them in terms of your desires, and sometimes they are more subtle and no words are spoken, for these preferences happen at many levels of your Being.
When you first awaken in the morning, after a few hours of sleep (and therefore a vibrational detachment from unwanted things), you are in your most positive vibrational state. If you would begin your day, even before you get out of bed, by looking for a handful of positive aspects in your life, you will begin your day in a more positive vein.
It makes no difference whether the thought you are thinking is one you have deliberately chosen to focus upon, or whether you are merely lazily observing something and therefore thinking the thought - you are still thinking the thought, offering the vibration, and reaping the manifestation results of that thought.