Erm... lol?

"I was up far too early" = I awoke at a time oft considered "early" by the scholars of the world.
"I'm ready for the knacker's yard" - a knacker's yard is a place where animals unfit for human consumption are slaughtered and turned into more useful things. Usually, the animals are old and worn out. When a horse is very old, for instance, it is taken to the knacker's yard and turned into glue. Thus, something being taken to the knacker's yard can be thought of as "worn out", which, when used in the correct context, can mean "tired". If, say, a rubber tyre is said to be "tired", then the rubber tyre is "worn out".

You may find it interesting to know that the term "knackered" found it's roots in a knacker's yard - it follows that for something to be taken to a knacker's yard, it must first be "knackered", which itself means "tired, worn out".

So when you put it all together, you get:

I awoke at a time oft considered "early" by the scholars of the world and, as a result, am tired and worn out. I bid thee good night, denizens of Zelaron.

EDIT: You could even say that I'm "all shagged out". But I doubt you'll understand that.