Light Therapy for Chronic Insomnia in General Practice

* Sleep disorders, especially insomnia * Attention deficits (or disorders), daytime somnolence and drug dependence * The goal is to evaluate whether light therapy could be used as an efficient alternative treatment with direct application in general practice

Insomnia affects 15 to 20% of the general French adult population and increases with age. General practitioners (GPs) are the first confronted to sleep disorders, especially insomnia. Cognitive-behavioral therapies (CBT) have proven effective, but their implementation in everyday practice is limited, and alternative treatments are still needed. Light not only has a great influence on the sleep-wake cycle and alertness, but also on mood and cognitive functions. The administration time of light condition will be calculated for each individual in a modality that has no impact on the circadian phase. Study will be conduct on an outpatient basis in general practice