Float therapy?

I've never heard of float therapy until I saw this article. Apparently, some derive benefit from floating in body temperature, salty water that is inside a sound-proof vessel. The article mentions that "float therapy" may help some with insomnia. I'm not aware of any studies to that effect - the report is only anecdotal. The article states that one reason it may help people sleep could be the same reason why a warm bath is helpful. I just hope people don't fall asleep while in the float chamber.