The National Study of Daily Experiences (NSDE) is a substudy of the Midlife in the United States project and is funded by the National Institute on Aging. The NSDE is the largest study of daily life in the United States by combining self reports of stress and well-being to biological markers of health. This instructional video explains the saliva collection portion of the (NSDE) step-by-step. It is less than 5 minutes long.