Evaluation of A Morning Dosing Of A New Medicine And Its Effects On Sleep At Bedtime In Subjects With Primary Insomnia

Inclusion criteria: * Difficulty going to sleep and/or staying asleep during at least the past 3 months. * Insomnia must result in significant distress or impairment in functioning at home, socially or at work. * Otherwise good health with no significant or unstable medical disorder including psychiatric, neurological, endocrine, heart, lung or gastrointestinal disorders, drug/alcohol abuse, cognitive impairment, cancer or chronic pain conditions such as arthritis. Exclusion criteria: * History of other sleep disorders such as sleep apnea or restless leg syndrome; regular sleep habits, including bedtime between 9 PM and midnight, nightshift/rotating shift work, frequent napping or planned travel across \>2 time zones. * Use to moderate use of nicotine, caffeine and alcoholic products.