Comparing Telehealth-Delivered CBT-I to Web-Based CBT-I to Enhance Sleep, Reduce Fatigue, and Promote Neuroprotection

Inclusion Criteria: * 18-65 years old * Diagnosis of relapsing-remitting or secondary progressive MS based on established guidelines21 and verified by their neurologist * Mild-to-moderately severe disability (≤ 6 on Patient Determined Disability Steps (PDDS) scale) * Report of difficulty falling asleep, maintaining sleep, or waking up too early at least 3 nights/week for the past 3 months with significant distress and impact on function despite adequate opportunity for sleep and not due to other sleep disorders as indicated in the DSM-5 * ≥10 on Insomnia Severity Index * English speaking * ≥31 on Telephone Interview of Cognitive Status * Has a high school diploma or equivalent to serve as a proxy measurement of reading ability to ensure adequate reading ability to participate in the study * Report having access to internet service or a data plan and access to a computer, tablet, or smart phone Exclusion Criteria: * Known untreated sleep disorder (such as sleep apnea or restless legs syndrome) * \>3 on STOP BANG indicating increased risk of sleep apnea * Restless legs syndrome as determined by RLS-Diagnosis Index * Circadian rhythm sleep-wake disorder as determined by the Sleep Disorders-Revised * Parasomnia as determined by the Sleep Disorders-Revised * If taking benzodiazepines, non-benzodiazepines, or melatonin supplements or agonists for insomnia, taking \< 3 months or dose has changed in past 3 months * Score of ≥20 on the Patient Health Questionnaire (PHQ-9) indicating severe depression or endorsement of suicidal ideation (answer 1, 2 or 3 on #9 of the PHQ-9) * Score of ≥15 on the Generalized Anxiety Disorder (GAD-7) indicating severe anxiety * Current or history (up to 2 years) of alcohol or drug or alcohol abuse as indicated by DSM-5 criteria * History of other nervous system disorder such as stroke or Parkinson's disease * Currently pregnant or intending to become pregnant in the next 6 months * Severe mental illness such as schizophrenia or bipolar disorder * Severe neurological or sensory impairments that would interfere significantly with testing * Relapse and/or corticosteroid use in the past 8 weeks * History of (within 5 years) or currently conducting overnight shift work including hours of midnight-4am * Currently receiving a behavioral sleep health intervention