Answer:
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
A precious gift, yet it has no end, no beginning, and nothing in the middle.
Humans have two that shrink in the light and expand in the dark
If you agree give me one of these.
Man's most important invention.
I am a room that has a roof but no walls. What am I?