Among the many things that can shatter when Alzheimer's disease tightens its grip is the steady rhythm of the body's sleep-wake cycle. The problem is so common that one New York City nursing facility—the Hebrew Home at Riverdale—ran an all-night program for many years that took in afflicted community members for a dusk-to-dawn schedule of games, snacks, arts and crafts, and other activities so that their exhausted families could get some shut-eye.