Simmons' ComforPedic mattress brand is getting its first national ad campaign, with TV spots featuring walls that are rear-projection screams showing celebrities dreaming. The effort, via Boston-based Arnold Worldwide touts the bed as “the better memory foam,” and the tag is, “Sleep smarter.” The pitch is that good sleep helps your IQ. “Smart begins with better sleep. Better sleep begins with ComforPedic," says the web site.