Titled “REM sleep disorder”, this fortnight’s Mind Matters column in Horizon (the supplement with The Assam Tribune) of Shyamanta Das (Editor-in-Chief of the Open Journal of Psychiatry & Allied Sciences [OJPAS®]) discusses the case report “Idiopathic REM sleep behaviour disorder: a case report” by Niranjan Hebbar YR, Ashutosh Dash, Dhananjay Patro, and Th Bihari Singh, and published in the current issue (January-June 2018, Volume 9 Issue 1) of OJPAS®.