REM Behaviour Disorder (RBD) is a parasomnia characterized by the absence of the physiologic muscle atonia during REM stage. The diagnosis of this disorder is based on the assessment of muscle activity and REM sleep without atonia (RSWA) by means of an electromyogram during polysomnography. In recent years RBD has attracted the attention of researchers because in its isolated form it is linked to the subsequent onset of neurogenerative diseases such as Parkinson's disease, dementia with Lewy bodies and Multiple System Atrophy. This study focuses on the analysis of polysomnographic reports from three different databases containing also RBD and RSWA patient records.