The articles in this collection are freely available through October 31, 2018.

In this virtual issue from SLEEP, the most important articles on REM Sleep Behavior Disorder (RBD) published in SLEEP over the past two years have been extracted. These articles demonstrate the breadth and depth of the expanding clinical research on RBD, covering new findings in epidemiology, clinical presentations, electroencephalography, differential diagnosis, association with paraneoplastic disorders and response of RBD to immunotherapy, along with new findings from the urgent research front of RBD as prodromal Lewy body disease and the strong links among RBD, Parkinson’s disease and Dementia with Lewy bodies. Two of the articles merited editorial commentary. Full access available here.