DR RV ANAND CONSULTANT NEUROLOGIST SAI NEUROCLINIC ABHRAMAPURAM SLEEP DISORDERS IN PARKINSON DISEASE sleep disorder can precede parkinson disease by several years.it ois in the form of REM sleep behavioural disorder.they may have vivid dreams night mares abnormal behaviour.they can yell , scream, or punch while sleeping potentially injuring themselves by falling out of the bed or hitting thier bed partner