Auditory Slow Wave Enhancement in Parkinson Disease and Mild Cognitive Impairment

The study aims to assess the efficacy of auditory slow-wave sleep (SWS) enhancement in PD patients and patients with amnestic MCI. Patients will be randomized to two groups: Group 1 will first be treated with auditory stimulation for two weeks and then - after a washout period - switched to two weeks of sham stimulation. Group 2 will first receive sham stimulation for two weeks and then - after a washout period - switch to two weeks of auditory stimulation treatment. The washout period in between will be 2-4 weeks.