VEC-162 Study in Adult Patients With Primary Insomnia

Inclusion Criteria: * Males and females with a diagnosis of primary insomnia as defined in DSM-IV. * Habitual bedtime between 9:00 pm and 1:00 am. * No history or evidence of restless leg syndrome or periodic limb movement disorder or sleep apnea. * Patients must sign a written consent form. Exclusion Criteria: * History of drug or alcohol abuse as defined in DSM-IV. * History of psychiatric disorders, including Major Depressive Disorder, Generalized Anxiety Disorder and delirium. * History of chronic obstructive pulmonary disease (COPD), seizures, sleep apnea, narcolepsy, circadian-rhythm sleep disorder, parasomnia or any sleep disorder other than chronic insomnia. * Recent history of shift work or jet lag.