Impact of Bright Light Therapy on Prader-Willi Syndrome

Inclusion Criteria: * Diagnosis of PWS confirmed by genetic testing * Score of 12 or above on the Epworth Sleepiness Scale (ESS). Exclusion Criteria: * Subjects with an eye condition that could be negatively affected by bright light such as patients with a history of retinal damage or patients needing photosensitizing medications * A history of previous treatment with LT * Patients presenting with active psychosis or mania