Answer:
You get many of me, but never enough. After the last one, your life soon will snuff. You may have one of me but one day a year, When the last one is gone, your life disappears.
What has thirteen hearts But no body or soul?
Iron roof, glass walls, burns and burns and never falls.
A seed am I, three letters make my name. Take away two and I still sound the same.
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.
You use it between your head and your toes, the more it works the thinner it grows.