Light Therapy for Chronic Insomnia in General Practice

Inclusion Criteria: * Complaining of chronic insomnia according to ICSD-3 (International Classification of Sleep Disorders) criteria and/or taking hypnotics at least 3 nights per week for more than 3 months. * Non-hypnotic medication: stable medication during one month preceding the inclusion and for the 8 weeks of the study. * Compliance with the treatment: the patient is able to have light therapy during the required time and at the agreed schedule. Exclusion Criteria: * Severe psychiatric disorder (severe major depression, schizophrenia, bipolar disorder), obvious acute psychiatric comorbidity. * Untreated intrinsic sleep pathology: sleep apnea syndrome based on clinical criteria: STOP-BANG questionnaire score, restless legs syndrome manifesting more than 2 times a week and/or requiring treatment. * Mild to severe dementia. * Neurodegenerative sleep troubles * Severe intercurrent pathology. * Ophthalmic troubles presenting a contraindication to light therapy: retinopathy, age-related macular degeneration, diabetic retinopathy, macular hole, epiretinal membrane); lens opacifications (cataract) justifying surgery (correction of poor visual acuity, visual discomfort); glaucomatous and non-glaucomatous optic neuropathy resulting in visual impairement. * Toxicomania, chronic alcoholism. * Secondary insomnia linked to somatic non-stabilized pathology. * Elements influencing circadian rhythm * Pregnancy, breastfeeding. * Participation in another interventional clinical trial which includes an exclusion period * No information could be given to the patient (subject faces emergency situation, comprehension difficulties, etc.) * Patient under guardianship * Non hypnotic treatment potentially inducing a level 3 sleepiness one week before