Effects Of GW679769 On Sleep Onset And Maintenance And Next Day Functioning In Subjects With Primary Insomnia

Inclusion Criteria:

- Difficulty going to sleep and/or staying asleep for 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.

- No nightshift/rotating shift work, frequent napping or planned travel across >2 time
zones.

- Use of nicotine, caffeine and alcoholic products.