It's neat how each stanza is four lines than the ending is three and reads with a gentle tone. "Unchain me like a melody" is chilling, love that line!

A few suggestions to tie your poem tighter. Up to you though. With the first stanza:

"Heated sheets are torn apart
The witching hour has dawned
let the frail hearted depart
to the edge of Heaven's seashore."

First line: You could take out "are" and write "Heated sheets, torn apart" or "Heated sheets- torn apart".

Third line: "frail hearted" should be "frail-hearted"?

The image of "Heaven's seashore" is lovely, and makes me think of Heaven as this endless sea that I cannot even fathom crossing.

"Sleep evades the troubled mind
as questions dance joyously
about things better left behind
but they conquered me mysteriously."

- I find this stanza to be a bit too vague? Maybe you could actually write down the questions... also the transition to the last line seems sudden, what things conquered you? I'm not sure if "mysteriously" works here either.

"sober and lighten my anchored words?"

- This is another one of my favorite lines! "Anchored words" has a certain punch to it, and I can imagine your words dangling from your mouth as you try to pull them in perhaps to save you. Lots of depth in that line.

Enjoyed the read.

I like this - it has a melodic flow to it and the first stanza is excellent. The rhythm of the poem reminds me a little of how I write, don't know whether you agree with that.