Adult Polysomnography Primary Insomnia Cross Over Study (0928-049)(TERMINATED)

Inclusion Criteria:

• Diagnosis of Primary Insomnia
• Patient is willing to stay overnight at a sleep laboratory for a total of 7 nights
• Patient is willing to avoid alcohol on PSG visits
• Patient will avoid napping during the course of the study
• Patient's bedtime is between 9pm and 1am

Exclusion Criteria:

• History of substance abuse, bipolar disorder or psychotic disorder
• Difficulty sleeping due to other medical condition
• History of narcolepsy, circadian rhythm sleep disorder, parasomnia, sleep apnea, periodic limb movements or restless legs syndrome
• History of neoplastic malignancy within the last 5 years
• Positive alcohol breath test during the screening visits