A Study to Evaluate the Effects of GW679769 on Sleep and Cognitive Function in Subjects With Primary Insomnia

A Randomized, Double-Blind, Placebo-Controlled, Crossover Study to Evaluate the Effects of GW679769 (30mg and 90mg) on Sleep Continuity, PSG Sleep Recordings, Subjective Sleep Assessment, and Daytime Cognitive Function in Subjects With Primary Insomnia

A study to investigate the effects of GW679769 on sleep and cognition. Potential subjects participate in a clinical screening visit and a two-night PSG recording session in the sleep laboratory. Eligible subjects then participate in three separate two-night PSG sessions in which they are randomized to receive placebo or one of two doses of GW679769 60 minutes prior to bedtime, one treatment for each session in a balanced order. Each treatment session is separated by a two-week drug-free period and occur on the same day of the week. A safety follow-up visit occurs 2 weeks after the last treatment session.

Inclusion Criteria:

• Healthy male and female subjects with primary insomnia with normal EG may be eligible for inclusion.

Exclusion Criteria:

• clinically significant physical or psychiatric illness or abnormal sleep patterns.