The National Institute on Aging (NIA) invites proposals for R01 research project grants (PA-13-125), R03 small grant programs (PA-13-123) and R21 exploratory/developmental research grants (PA-13-124) to study regional and international differences in health and longevity at older ages.  Behavioral risk factors of interest include sleep duration and sleep quality. Environmental exposures and risk factors are also of interest.  Standard application dates apply.