The first warning of Parkinson's disease may be the experience of nightmares during sleep, scientists have revealed.

Normal sleepers are effectively paralysed during REM or rapid eye movement because the brain shuts off the muscles allowing the body to properly rest.
But this doesn't happen to those with REM disorders, who often act out their dreams with violent movements.
Scientists in Barcelona found that a fifth of those over 60 suffering from the condition went on to develop Parkinson's, and other degenerative diseases such as Lewy body dementia.
The team of researchers led by Alex Iranzo at the Neurology Department of the Hospital Clinic in Barcelona looked at 43 patients over the age of 60 who had all been diagnosed with REM sleep disorders.
They found that 30 per cent had developed some form of neurological disorder two and a half years after their sleeping problem was diagnosed - in most cases Parkinson's.
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The study was published in the Lancet Neurology journal.
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