Sleep Healthy Using the Internet Mitigating Insomnia to Address Neurocognitive Difficulties (SHUTi MIND)

Inclusion Criteria: * Provision of signed and dated informed consent form * Stated willingness to comply with all study procedures and availability for the duration of the study * Male or female, aged ≥ 65 years of age. * Able to speak and read English, and is a US resident. * Have access to any Internet-enabled device (computer, tablet, smartphone) and willing to be emailed about the study. * Sleep-onset insomnia and/or sleep maintenance insomnia symptoms * The sleep disturbance (or associated daytime fatigue) causes significant distress or impairment in social, occupational, or other areas of functioning over the past three months. * Cognitive impairment through study assessment. * Stable medication regimen unless medication is known to cause insomnia Exclusion Criteria: * Current psychological treatment for insomnia * Initiation of psychological or psychiatric treatment within the past three months * Current diagnosis of Huntington's or Parkinson's disease * Current treatment for hyperthyroidism * Currently undergoing chemotherapy * Presence of asthma or respiratory concerns with night treatment * Chronic pain treated with opioids * Not recovered from a brain tumor, injury, or infection * Epilepsy without stable treatment for at least 3 months * Irregular sleep schedule * Use of stimulating medications after 5pm or taken for less than 3 months * Psychotic or bipolar disorder * Moderate to high risk of suicide * Alcohol or drug abuse within the past year * Other untreated sleep disorders (e.g., obstructive sleep apnea) * Study screen for severe depression