Some people who act out their dreams, screaming, laughing and even getting violent during sleep, may develop dementia in later life, a new study warns.
Isolated REM sleep behaviour disorder (iRBD) affects up to 2 per cent of older adults, and the condition is characterised by the loss of normal muscle paralysis when people dream. Rapid eye movement (REM) is the stage of sleep characterised by increased brain activity, limited muscle movement, darting eye movement, and fluctuating respiration and heart rate.
