The Vanderbilt Sleep Research Core offers two hard-wired sleep systems with synchronized video-polysomnography and 21 channels of EEG, with dedicated registered sleep technologists. A sleep core/sleep reading center manager and the core director (Dr. Beth Malow) assist investigators with protocol development. It offers polysomnography, titrations with continuous positive airway pressure, multiple sleep latency testing, and wrist actigraphy (wireless devices that measure sleep-wake patterns non-intrusively based on accelerometers that measure activity vs. rest). The core provides for centralized scoring of polysomnography and actigraphy data for multicenter trials. In addition to the scoring component, emphasis is placed on the quality of the sleep recordings at the individual sites with close communication among the individual site technologists and the sleep core manager.