I had some mercury fillings taken out several years ago, and the doc recommended an epsom salt bath every night for three months with water as warm as I could stand.
It absolutely knocked me out, and my sleep was amazing. I remember more than once, dragging myself to bed with my bath towel around my waist, and falling asleep on top of my covers with the towel still there.
I don’t know if there’s something detoxifying about it, or pro-metabolic, or something. But I sure did enjoy my salt baths.