Inclusion Criteria:  Adults ages 18-60 years of age previously diagnosed with narcolepsy type I (NT1), narcolepsy type 2 (NT2), or idiopathic hypersomnia (IH). Requiring daily wake promoting medication(s) continuously for 3 months for diagnosed NT1, NT2 or IH with symptomatic improvement on treatment documented by standard subjective or objective tools.  Exclusion Criteria:  Presence of a diagnosed or suspected co-morbid sleep-related breathing disorder, parasomnia, or other sleep-related movement disorder. Unstable psychiatric disorder (e.g., acute psychosis, acute suicidal ideation or major depressive episode, active substance abuse/dependence). History of malignancy (active or in remission for < 2 years) or active infectious disease at time of screening. Inability to safely tolerate wearing earbuds due to recent injury, skin breakdown, or infection. Uncorrected near visual acuity no worse than 20/50.