The visuals here are stunning and that in my eyes makes this well written. Perhaps i am biased because i am a visual poet but you did well to make a story out of it and the metaphors are beautiful.
You had warmth in your life and in what you wrote it feels like either you or another person were that sun and all was good in your life. But over time that sun vanished and i feel like the salt is a keyword because salt could mean anger. So the sun was too hot and it burned anyone in it's way.
So the sun made you lose yourself and you vanished (you lost yourself quietly because your voice was silenced).
You got lost into an ocean that you drowned in from sleepless nights and tears. And in that you break the dawn. I believe the dawn breaking means you sleep at dawn now because of the presumption of insomnia. Anyways i also loved this.