Answer:
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
What begins and has no end? What is the ending of all that begins?
What can be heard and caught but never seen?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
When is it bad luck to see a black cat?