While no scientific studies or research that explains, supports, or disproves the soap theory currently exist, a basic online search reveals countless testimonials from people all around the globe who swear by it. They claim that after sleeping with a bar of soap their excruciating, painful leg cramps and other unbearable RLS symptoms quickly disappeared all together, or at least enough to where they could sleep comfortably again. All they had to do was place a bar of soap in their bed sheets, sit back, relax, and let it do its magic.