When I Dream, Do I Misbehave?
Normally, rapid eye movement (REM) sleep is associated with dreams and physiologic muscle atonia—aka paralysis. But in patients with REM sleep behaviour disorder (RBD), the normal suppression of motor activity is lost, leading people to move in response to their dreams; this so-called “dream enactment behaviour” can often be violent.
The vast majority of patients with RBD eventually demonstrate signs and symptoms of Parkinson’s disease or a related disorder, often after a prolonged interval. In one study, the risk rose by about 6% each year, with three-quarters of participants converting within 12 years. Even in cases that appear not to follow that progression, imaging and autopsy studies often demonstrate changes otherwise associated with Parkinsonism.
There is no known treatment to prevent the onset or progression of Parkinson’s.