Can better sleep ease knee pain? new study tests sleep therapy for osteoarthritis

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 45 years old or older Being a fluent Dutch speaker Commits to study requirements Knee Osteoarthritis classified using the American college of Rheumatology criteria (Knee pain + 3/6 for diagnosis): * age\>50 * morning stiffness \<30 minutes * crepitus * bony tenderness * bony enlargement * no palpable warmth Insomnia diagnosis using the DSM-5 criteria: * No shiftwork * No severe untreated sleep disorders * For at least \>3 days / week for \>3 months: \>30 minutes sleep latency and/or \>30 minutes awake after sleep onset and/or early-morning awakening with inability to return to sleep AND associated daytime symptoms Knee pain nominated by the patient as 3 or higher on a visual analogue scale on most days of the last 3 months Informed consent Exclusion Criteria: Treatment with supervised exercise therapy or joint infiltrations (e.g., corticosteroids, hyaluronic acid) or CBT-I in the preceding six months Change in any psychiatric or psychological treatment the last 3m or planned during the study period Concurrent intense psychological treatment (weekly basis) BMI \>30 Mini-Mental state examination score of 23 or lower Being on the waiting list for a knee replacement or having received knee replacement on symptomatic side Any contra-indication for exercise therapy Existing diagnose that has impact on sleep and patients are therefore unlikely to respond to CBT-I: any rheumatological condition (e.g. rheumatoid arthritis, Lupus, Sjogren's syndrome); any neurological conditions (e.g. stroke, Multiple sclerosis, Parkinson's disease), dementia or receiving cholinesterase inhibitors; cancer diagnosis in the past year and receiving chemotherapy or radiation therapy in the past year; Long-COVID or inpatient treatment for congestive heart failure within the prior six months. Having severe underlying sleep disorder (obstructive sleep apnea over AHI \>15, periodic leg movement disorder, restless leg syndrome, sleep-wake cycle disturbance, rapid eye movement behavior disorder) Being pregnant or given birth in the preceding year Having an external/ physical factor that limits the opportunity to sleep (E.g. newborn)