How powerful is your brain?

The other night my husband came roaring out of bed with both legs cramping in the back of his thighs. He was stretching and yelling, nothing was working. I told him to stop and use his brain. Think inside his head and have his brain send a message to his thigh muscles to relax. Just keep doing it, try to follow the message down the spine and to the site. He did and after a few tries it worked, and it did not come back. I do that all the time with those annoying little muscle twitches.