Fun Riddles

Question: What loses its head in the morning and gets it back at night?

Question: What jumps higher than a building?

Question: A man and his boss have the same parents, but are not siblings. How is this possible?

Question: A man walks all the way around the world without getting wet.

How does he do this?

Question: 500 is at my end and my start, yet 5 is at my heart.
The first letter and the first number make me complete.
My name is that of a king.

What am I?