Answer:
When one does not know what it is, then it is somethingอพ but when one knows what it is, then it is nothing.
Its fleece is warm and wooly white. And when you lie awake at night, count it and you'll fall asleep. What is it?
The famous royal young lady who had several short men following her.
What gets whiter the dirtier that it gets?
Words come out of it, aligned in perfect silence. A messenger of black on white, a slinky fellow drawing lines, of thin and soft graphite
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.