What Am I Riddles

Question: He has married many women, but has never been married. Who is he?

Question: What goes up, lets out a load, then goes back down?

Question: There is a story that a man and not a man
Saw and did not see a bird and not a bird
Perched on a branch and not a branch
And hit him and did not hit him with a rock and not a rock.

[How is this possible?]

Question: If it's information you seek, come and see me.
If it's pairs of letters you need, I have consecutively three.

Who am I?

Question: What always goes to bed with its shoes on?