5th/final stanza-Breakdown

The use of the word "plank" maybe reference to the coffin or even a plank beside the grave. It i put beside the word "Reason" to give emphasis to the intense emotions she is feeling.
This plank breaking might be describing her mind breaking through to a new understanding
The dropping down is in relation to "space" used in the third stanza.
The "World" that she has discovered is a mystery that is associated with death
The poem end when the poet ends..
"Then" leaves us wondering, is there life after death?
Dickinson has found some sort after life but we as living people cannot relate.
She ends with a dash that indicates an onward experience beyond our life.

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The poem and breakdowns on each stanza

I felt a Funeral, in my Brain - Emily Dickinson