Answer:
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
What is lengthened by being cut at both ends?
Bright as diamonds, Loud as thunder, Never still, A thing of wonder.
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like skin but is fine as hair?
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack.
It's what light turns into in the night