Why is this the answer?

The answer is stars because this lovely riddle is giving us clues about the tiny, bright lights that fill the night sky every single night. The stars are some of the most amazing objects in the whole universe. Let us look at the first line of the riddle: "We are all around, yet to us you are half blind." This is a very clever way to talk about how many stars there are. The stars are always there, all the time, even when you do not see them. They are all around our planet Earth, shining in every direction. But because the sun is so bright during the daytime, we are "half blind" and cannot see them. It is like the stars are hiding from us until the sun goes away. The second part of the riddle gives us an even bigger clue: "Sunlight makes us invisible, and difficult to find." Think about looking up at the sky during the day. What do you see? You see the blue sky and maybe some clouds, but you definitely do not see any stars. This is not because the stars go away. It is because the light from our sun, which is the closest star to Earth, is so powerful. The sun's bright light shines so strongly that it blocks out the light from all the other stars that are much farther away. It is like turning on a bright light bulb right next to a tiny night-light. You can only see the bright one. But when the sun sets and the sky gets dark, the sunlight fades away. That is when the night sky is finally quiet enough for the light from all those distant stars to reach your eyes. They twinkle and shine, and you can see that they really are all around. This riddle is a beautiful way to describe how the sun's bright light makes the other stars invisible until the sun takes its rest. It is a wonderful secret of the sky.