A KISS Grammar Punctuation Exercise

The Opening of "The Tell-Tale Heart"
-- Edgar Allan Poe

Directions: Fix the punctuation and capitalization in the following text. (This one is not easy. -- Hint: Poe used five dashes in this passage.)

     true nervous  very very dreadfully nervous i had been and 

am but why will you say that i am mad the disease had sharpened 

my senses  not destroyed  not dulled them above all was the 

sense of hearing acute i heard all things in the heaven and in the 

earth i heard many things in hell how then am i mad hearken

and observe how healthily  how calmly i can tell you the whole story