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Inclusion Criteria:

* Informed Consent signed by the subject
* PD according to the MDS clinical diagnostic criteria for Parkinson's disease
* Suffering from reduced sleep quality as defined by pathological cut-off (score of \> 5) on the Pittsburgh Sleep Quality Index (PSQI)
* Patients with stable antiparkinsonian, antidepressant, and sleep medications for six weeks before intervention and maintained on stable medication during the intervention period
* Treatment without bilateral deep brain stimulation
* Fluent in German

Exclusion Criteria:

* Brain disease other than Parkinson's disease (e.g. atypical Parkinsonism, Alzheimer's disease, vascular dementia, multiple sclerosis, stroke, traumatic brain injury, epilepsy, etc.).
* Dementia as defined by a MOCA score lower than 24/30
* Weight \> 150kg
* Depression with acute suicidal ideation
* Presence of major ongoing psychiatric illness such as acute non-controlled psychosis
* Poor general health (e.g. non-controlled diabetes, uncontrolled arterial hypertension, therapy for malignancy)
* Inability to follow the procedures of the study, e.g. filling out patient questionnaires due to language problems, psychological disorders, dementia, etc. of the participant
* Participation in another interventional trial within the 30 days preceding and during the present study
* Participants with PSQI score lower or equal 5

• Bern, Switzerland
• Zurich, Switzerland