Effects Of GW679769 On Sleep Onset And Maintenance,And Next Day Functioning In The Elderly And Non-elderly With Primary Insomnia

A Randomized, Double-blind, Placebo-controlled, Cross-over Study to Evaluate the Effects of GW679769 on Polysomnographic Sleep Recordings, Subjective Sleep Assessment, and Daytime Cognitive Function in Elderly and Non-elderly Subjects With Primary Insomnia

This study is designed to find the optimal (best) doses of GW679769 that promote sleep onset and maintain sleep during two consecutive nights of dosing without significant next-day thinking impairment and drowsiness 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.
• Nightshift/rotating shift work, frequent napping or planned travel across >2 time zones.
• Use to moderate use of nicotine, caffeine and alcoholic products.