Disturbed sleep tied to Parkinson’s risk

Thrashing and flailing during sleep might be a warning sign of future disease or dementia

People who kick and lash out while fast asleep in bed face a high risk of developing Parkinson’s disease and certain forms of dementia, scientists report online December 24 in Neurology.

The condition, called rapid-eye-movement sleep behavior disorder, results when a person’s muscles fail to relax during sleep.