In recent years wearable commercial devices, such as smart wrist-bands, have become popular principally for sport activity monitoring. Among them, almost all the major marketed models are also able to evaluate the quality of a person's sleep, identifying the sleep stages and their durations. From a medical point of view, sleep stage patterns constitute an important preliminary exam in the diagnosis of sleep disorders, or possibly in the prevention of the same. Rapid Eye Movement (REM) sleep behavior disorder is one of the well-known sleep disorders, with a prevalence of around 2% in older adults, being a prodromal syndrome of neurodegeneration, and causing them Parkinson disorder (33–50%), multiple system atrophy (80–95%), and dementia with Lewy bodies (80%). It is advantageous therefore to have an automatic tool for REM sleep disorder detection that does not require the use of high-cost medical …