researchers have discovered about half of people with rbd will develop parkinson 's disease or another neurological disorder within a decade of being diagnosed , livescience reports .
people with rapid eye movement sleep behaviour disorder -lrb- rbd -rrb- move around in their sleep and ` act out ' their dreams .
up to 90 per cent of people with the condition will develop a neurological condition , a new review suggests .
if you get this disorder and live long enough , you will almost certainly get parkinson 's disease or a condition similar to it .