Prodromal Development of REM Sleep Behavior Disorder
Which early signs predict who will develop REM sleep behavior disorder among people who repeatedly act out dreams and close relatives of affected patients?
Following these groups over time could clarify which early features signal progression. The studies address risk factors, dream enactment without the loss of normal REM muscle relaxation, and changes in first-degree relatives.
Where it stands now
Main bottleneck
The bounded records do not establish which proposed markers reliably predict later REM sleep behavior disorder, particularly when dream enactment occurs while normal REM muscle relaxation is preserved.
Watch next
Longitudinal results showing whether baseline risk factors or early markers distinguish people who subsequently develop REM sleep behavior disorder from those who do not.
Progress timeline
How the evidence has changed over time.
2022 · 3 updates
- What dream enactment can tell researchers after a sleep recordingResearch note 1 of 3 · Source date 2022-03-02
- What relatives may reveal about the earliest signs of REM sleep behavior disorderResearch note 2 of 3 · Source date 2022-04-29
Since the previous research note · Earlier expectation not tested
Track continuity
Since the previous research note: When acting out dreams and REM sleep recordings do not align
Previous expectation: Understanding why dream enactment and sleep recordings disagree might eventually help clinicians tailor neurological follow-up.
What this study adds: This registry describes a family cohort with isolated sleep features and more early markers among relatives of affected patients than among relatives of controls, motivating prospective follow-up. It brings a family-population comparison into the timeline without testing whether the earlier mismatch distinction improves clinical decisions.
Current research note
- When acting out dreams and REM sleep recordings do not alignResearch note 3 of 3 · Source date 2022-04-29
Since the previous research note · Earlier expectation not tested
Track continuity
Since the previous research note: What dream enactment can tell researchers after a sleep recording
Previous expectation: Validated predictions over time could eventually improve counseling and earlier neurological recognition for people with confirmed isolated REM sleep behavior disorder.
What this study adds: The April 2022 registry introduces a different question about recurrent dream enactment without sufficient recorded REM sleep without atonia. Its proposed validation does not test the earlier forecast of useful longitudinal predictions in confirmed disorder.
Current research note
How this Track works
This page changes as new evidence arrives. Open any update to see what researchers found at that point in the story.