Evaluating the Effects of Tasimelteon vs. Placebo in Treating Pediatric Insomnia

Inclusion Criteria: * Ability and acceptance to provide written informed consent of the participant or legal guardian (and assent as required). * Confirmed clinical diagnosis of insomnia disorder * Males and Females between 2 and 17 years, inclusive. * The sleep disturbance must not be a result of another medication. Exclusion Criteria: * Inability to dose daily with tasimelteon or previous intolerance to tasimelteon. * Indication of impaired liver function. * Pregnant or lactating females. * A positive test for drugs of abuse.