Abstract
Patients with REM sleep behavior disorder (RBD) enact their dreams, leading to enhanced
dream recall. They report more negative emotions in their dreams, recall retrospective
nightmares more frequently, and often experience more aggressive dreams. This study
aims to understand dream characteristics in REM sleep behavior disorder using both
retrospective and prospective measures in a controlled sleep laboratory setting to
address possible recall biases in retrospective dream recall frequency. The sample
comprises 102 iRBD-diagnosed patients (21 women, 81 men; M = 64.08, SD = 11.27) and
208 healthy controls (136 women, 72 men; M = 30.08, SD = 12.03), all undergoing identical
procedures of two consecutive nights in the sleep laboratory, enabling a robust comparative
examination of dream patterns. Retrospective assessments revealed a higher frequency
of dream recall in patients with iRBD, while no significant difference was observed
in prospective assessments. Nightmares were also reported more frequently in retrospective
assessments in iRBD patients compared to healthy controls. Aggressive dream content
was more frequent in patients with iRBD compared to controls, a future prospective
diary study might clarify whether this heightened aggression in dreams is related
to waking-life traits.
Keywords
dream recall - nightmares - REM sleep behavior disorder - dream content - aggression