There’s always a chance of that, the mind is powerful. I can say that I’ve gotten more restful sleep using this than I get if I take 5mg of indica. What I’ve found is there are some fairly decent peer reviewed studies supporting the benefits. You won’t find them in the mainstream though because if the benefits are real it would upset Big Pharma’s applecart in a major way. The sheet was $99 but there are devices that are far less expensive on Amazon.