InsomniaBy: Marina Benjamin An insomniacs ideal sleep aidand thats a compliment. With her collage of ruminations about sleeplessness, [Benjamin] promises no real cure . . . Her slim book is what the doctor ordered.The Atlantic Insomnia is on the rise. Villainous and unforgiving, its the enemy o f energy and focus, the thief of our repose. But can insomnia be an ally, too, a validator of the present moment, of edginess and creativity? Marina Benjamin takes on