Almorexant (ACT-078573) in Elderly Subjects With Chronic Primary Insomnia

Multicenter, Double-blind, Randomized, Placebo-controlled, 5-period, 5-treatment Crossover, Dose-finding Study to Evaluate the Efficacy and Safety of Oral Administration of ACT-078573 in Elderly Subjects With Chronic Primary Insomnia

A 2-night polysomnography / 5-way cross-over study to evaluate the effect, safety and tolerability of oral administration of almorexant (ACT 078573) in elderly subjects with primary insomnia.

Inclusion Criteria:

• Elderly subjects (> 64 years) with a diagnosis of primary insomnia.

Exclusion Criteria:

• History of any sleep disorder, or any Diagnostic and Statistical Manual of Mental Disorders IV (DSM-IV) axis I disorder other than primary insomnia.
• Sleep apnea, or restless legs syndrome.
• Daytime napping of more than 1 hour per day.
• Important caffeine consumption, heavy tobacco use, alcohol or drug abuse within 2 years prior to the screening visit.
• Unwillingness to refrain from drugs, over-the-counter or herbal medication having an effect on sleep or behavior.