People with recurrent isolated sleep paralysis (RISP) may have greater underlying cortical activity during sleep compared to people without RISP. Sleep macrostructure and rapid eye movement (REM) sleep fragmentation appear similar between the two groups.
Why this matters
RISP is a form of sleep paralysis marked by recurrent episodes of conscious paralysis at sleep onset or on awakening, often causing significant emotional distress.
The pathophysiology of RISP remains unknown and there is limited research into sleep paralysis using polysomnography measures. However, it has been suggested that sleep paralysis episodes are marked by a dissociated state of consciousness combining features of both REM sleep and waking brain states.