Study to Evaluate the Pharmacokinetics, Pharmacodynamics, and Safety of Armodafinil in Children and Adolescents With Excessive Sleepiness Associated With Narcolepsy

Inclusion Criteria: * Written informed consent is obtained from each patient's parent or legal guardian and written assent is obtained from each patient. * The patient is a male or female 6 through 17 years of age with a body mass index (BMI) equal to or greater than 10th percentile for age and gender, inclusive. * The patient has a diagnosis of narcolepsy with cataplexy or narcolepsy without cataplexy according to the criteria established by the International Classification of Sleep Disorders (ICSD)-2 for narcolepsy. Exclusion Criteria: * The patient has any clinically significant uncontrolled medical condition (treated or untreated) other than narcolepsy. * The patient has a clinically significant deviation from normal in ECG, physical examination or vital sign findings, as determined by the investigator or medical monitor. * The patient is pregnant or lactating. (Any patient becoming pregnant during the study will be withdrawn from the study) * The patient has any history of seizures, including febrile seizures, or a family history of seizures (in parents or siblings) which is not a consequence of trauma, stroke, or metabolic disturbance. * The patient has a history of head trauma associated with loss of consciousness. * The patient has current suicidal ideation, a history of a suicidal ideation, or a history of a suicide attempt. * The patient has a history of major depressive disorder, bipolar disorder, other significant mood disorders, schizophrenia and other psychotic disorders, eating disorders, or has a family history of suicide. * The patient has left ventricular hypertrophy or the patient has mitral valve prolapse and has experienced mitral valve prolapse syndrome. * The patient has received any investigational drug within 30 days or 5 half-lives (whichever is longer) before the 1st dose of study drug, or in the case of a new chemical entity, 3 months or 5 half-lives (whichever is longer) before the 1st dose of study drug. * The patient has used any monoamine oxidase inhibitors (MAOIs) or stimulants within 14 days or 5 half-lives (whichever is longer) of the baseline visit. * The patient has used modafinil or armodafinil within 4 weeks of the baseline visit. * The patient has used an inducer of CYP3A4/5 within 28 days prior to study drug administration. * The patient has used an inhibitor of CYP3A4/5 within 14 days or 5 half lives (whichever is longer) prior to study drug administration. * The patient has a known sensitivity or idiosyncratic reaction to any compound present in modafinil or armodafinil, their related compounds, or to any metabolites or compound listed as being present in these medications. * The patient has a history of any clinically significant cutaneous drug reaction, or a history of clinically significant hypersensitivity reaction, including multiple allergies or drug reactions * Other criteria apply, please contact the investigator for additional information