Nightmares

I am a nightmare,
Spawned from the darkest of souls,
Always tormenting you even awake,
I am never far,
Just turn around,
I am feasting on your sanity,
Turning you corrupt,
You see me every night,
Before you rise and after you fall,
I am a disease with no cure,
I leave behind fear in your soul,
I devour your sweet dreams,
And leave corrupted ones behind,
I am the spiders in your head,
I am the snakes under your bed,
I am the coffin they lock you in,
For you see what I really am,
Your worst nightmare till the very end.