Inclusion Criteria:  Patients with a diagnosis of moderate to severe plaque type psoriasis confirmed by the principal investigator. Moderate to severe psoriasis will be defined as affected BSA ≥3%. Healthy controls will be age, sex, and BMI matched (see below) subjects with no prior or current history of psoriasis. Are at least 18 years of age Psoriasis has been stable over the last 3 months Psoriasis is either untreated or treated only with topicals at the current time (see exclusion criteria for washout times) Subjectively reported poor sleep quality using the Pittsburg Sleep Quality Index (PSQI) (defined as a global score >5) Fluent in English Demonstrate understanding of the study and willingness to participate as evidenced by voluntary informed consent  Exclusion Criteria:  Patients with guttate, erythrodermic, or pustular psoriasis subtypes Having a previous diagnosis of obstructive sleep apnea (OSA) or another medically defined sleep disorder or fall into the intermediate or high-risk groups for having OSA as calculated by the STOP-BANG questionnaire Subjects who have used the following treatments for psoriasis: phototherapy (UVB) in the last 2 weeks, photochemotherapy (PUVA) in the last 4 weeks, oral systemic treatments in the last 4 weeks, biologic immunomodulating agents in the last 12 weeks, or have had exposure to any other investigational drug/device within 30 days prior to study entry Subjects who have used any over the counter or prescription sleep aids within five half-lives of the agent in question.