Answer:
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
What is that over the head and under the hat?
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.
What is given but kept by the giver?
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
What language does a billboard speak?