What Am I Riddles

Question: Follower of man, Dark as night, A trained Choreographer, Comes after light.

Question: If you throw me out of the window,
I'll leave a grieving wife.
Bring me back, but through a door,
You'll see someone giving life.

What am I?

Question: You are my brother, but I am not your brother. Who am I?

Question: A man shaves several times a day, yet he still has a beard.

Who is this man?

Question: The more you take, the more you leave behind.
What are they?