Inclusion Criteria:  Self-report providing high-intensity unpaid care (e.g., practical, medical, and/or emotional support) to a family member or "family-like" close individual, operationalized as a function of time spent caregiving and care task involvement. Self-report expecting to continue provide high-intensity care for at least another 3 months. Have access to any Internet-enabled device (computer, tablet, smartphone) and willing to be emailed about the study. Insomnia severity index score >= 10 Residing in the United States or U.S. territory English literacy  Exclusion Criteria:  Unusual average bed/wake times, including for shift work Current behavioral/psych treatment for insomnia Medical contraindication (Restless Leg Syndrome/Periodic Limb Movement Disorder, Obstructive Sleep Apnea, narcolepsy, parasomnia, dementia, Parkinson's, Huntington's, stroke, traumatic brain injury, brain infection/tumor, pregnancy/breastfeeding, hyperthyroidism, cancer, severe respiratory disease, epilepsy) Psychiatric contraindications (mania/hypomania, alcohol or substance abuse/dependence) Changes to prescription medications in the past 3 months (sleep, steroid, amphetamine, other wake-promoting) Severe computer literacy challenges