Answer:
Who works when he plays and plays when he works?
My first is a body of water. My second is me. My third came before. My fourth before all three. My fifth sounds like my first. My sixth is in a lake. Put all six together to make an animal that will keep you awake.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
What never gets any wetter no matter how hard it rains?