Dear Saffie,
This is an Intense write.
the poem reveals a real dark and scarry space,
The whole idea that something dark lurks in your dreams which will attack when we are vulnerable and asleep - that really makes me get the chills-
Cant imagine a plight where someone is so controlled by the fear wherein you would want to avoid sleep in totality.. really scarry thought.

Great imagery the following lines- the helplessness is vivid.
I can't find a delete button for my nightmares,
and my mind continues to make movie scenes
in my dreams of unspoken fears.

Nice work.

All the Best.

Jay.