Courtney Worley, PhD, MPH , is a diplomate in behavioral sleep medicine, and board-certified clinical psychologist specializing in evidence-based interventions for sleep and trauma. Worley previously led the national implementation of written exposure therapy in the Department of Veterans Affairs (VA) as a system-wide training program. In her clinical practice at Upward Behavioral Health, she provides virtual services across the United States using evidence-based psychotherapies, including specialized sleep interventions and psychotherapies for post-traumatic stress disorder (PTSD). She serves as a trainer and consultant in the United States and internationally for clinicians and health care systems implementing evidence-based psychotherapies for PTSD. Her sleep research program includes investigating nightmare epidemiology and the comorbidity between nightmares and other psychiatric disorders. Michael R. Nadorff, PhD , is professor of psychology at Mississippi State University. He completed a nightmare treatment study as his dissertation project, and has worked in nightmare treatment for well over a decade.

His research focuses on the association between nightmares, as well as other sleep difficulties, and suicidal behavior. Nadorff has published more than one hundred peer-reviewed manuscripts, and has been cited more than 4,700 times. He has received more than fifteen million dollars in grant funding, with active external grant awards from NIMH, SAMHSA, and the CDC. He is also past president of the Society of Behavioral Sleep Medicine. Foreword writer Brigitte Holzinger, PhD , is a clinical and health psychologist, licensed teacher, psychotherapist, sleep coach, and licensed somnologist (ESRS). Her research focuses on sleep, dreams, lucid dreaming, and nightmares. Holzinger cofounded the Austrian Sleep Research Association (ASRA) and the Institute for Consciousness and Dream Research (ICDR) in Vienna, Austria.