Causes of Acting Out Dreams

Introduction to REM Sleep Behavior Disorder

The primary causes of acting out dreams during sleep include REM sleep behavior disorder (RBD), which can be isolated/idiopathic, secondary to neurodegenerative diseases, or drug-induced, particularly by serotonergic medications, according to the American Academy of Sleep Medicine 1, 2

Isolated/Idiopathic RBD occurs without a clear underlying disorder or inciting medication/substance, typically affecting older adults, who are generally younger than those with neurodegenerative disorders but older than those with drug-induced RBD, as stated by the American Academy of Sleep Medicine 3
Drug-Induced/Exacerbated RBD is most commonly caused by serotonergic antidepressants, particularly selective serotonin reuptake inhibitors (SSRIs), according to the American Academy of Sleep Medicine 1, 2

Dream enactment behaviors vary widely from night to night and between patients, with most movements being small twitches and brief jerks affecting the extremities, occurring every few seconds to minutes, as reported by the American Academy of Sleep Medicine 2

Polysomnography shows sustained muscle activity (tonic activity) during REM sleep, which is a key diagnostic feature of RBD, as noted by Praxis Medical Insights 4

Environmental safety measures are crucial to prevent injuries, and pharmacological options include melatonin, according to the American Academy of Sleep Medicine 2, 5
For drug-induced RBD, discontinuation of the inciting medication if safe to do so, or switching to agents with lower serotonergic profiles, is recommended by the American Academy of Sleep Medicine 1, 2

RBD is common, affecting approximately 80 million patients worldwide, with age being the greatest risk factor, according to the American Academy of Sleep Medicine 2