I follow you all day long,
but the moment the sun sets
I vanish without a sound.
What am I?

Your shadow.. A loyal companion that needs light to exist. The riddle works because we treat the shadow as ours — it actually belongs to the sun.

Question

Accepted Answer

Your shadow. — A loyal companion that needs light to exist. The riddle works because we treat the shadow as ours — it actually belongs to the sun.