The placebo effect drives an element of expectation or belief for people taking part in a medical test, when they don't know whether they're taking the 'real thing' or are part of a control group. In this episode, Adam Cox uses the metaphor of a sleeping tablet rather than the actual thing to drive that placebo suggestion, thereby inducing a self-fulfilling policy to help you sleep. An added bonus here, too: there's no wake-up call at the end of the session, so you can just keep on sleeping!
