Lewy body dementia (LBD) is the “other” dementia and it can be linked to REM Sleep Behavior Disorder, as the Cleveland Clinic explains.

“We can diagnose the sleep disorder with a sleep study. And there’s a high chance that a person with this disorder will develop LBD or Parkinson’s disease,” says Dr. Leverenz. “Often when someone comes in for an evaluation, and we ask about sleep disturbances, the bed partner says, ‘Oh, they’ve been doing that for years.’”