A Study of ORX489 in Healthy Adult Participants, Aged 18 to 60 Years

Inclusion Criteria: * Healthy males or females as determined by assessments at the Screening Visit. * For Parts A, B, C, and D: Participants must be at least 18 years of age and no more than 60 years of age at the Screening Exclusion Criteria: * Presence of significant cardiac, pulmonary, gastrointestinal, hepatic, renal, hematological, malignancy, endocrine, neurological, or psychiatric disease, as determined by medical history, physical examination, and screening investigations. * History of seizure disorder, any other condition that increases the risk of seizure * Has a clinically significant sleep disorder, including insomnia or sleep apnea