Michael McGirr always had trouble sleeping. The arrival of twins, however, made him realize that he'd never before known true exhaustion. And while he celebrated these small children who brought him so much joy and tiredness, he found himself on a desperate and bone-weary journey in search of just a few extra winks a night. It was an adventure that would teach him more about what exactly sleep is, why we need it, and what it means when we don't get enough of it.