Treasurys, as low as yields are, are higher than they are in most other developed countries. A foreign investor picks up a yield spread in Treasurys versus their own sovereigns, plus the fact that if the dollar is going to continue rallying - and I think it will because it's a safe haven - then they get a currency translation gain as well.
You will notice the phenomena of meditation. You may see dazzling lights, feel energy coursing through different parts of your body, feel as if you are floating, hear sounds, or smell fragrances.