Does Style Matter: Comparison of Moderate- to Low-intensity Styles of Yoga

The goal of this clinical trial is to learn if yoga works to improve sleep and heart health in adults with and without insomnia disorder. The main questions it aims to answer are: * Does the style of yoga impact participants heart health overnight? * Does the style of yoga improve participants sleep following a single session? Researchers will compare adults with insomnia disorder to adults with healthy sleep . Participants will: * Complete a moderate-intensity yoga practice, a low-intensity intensity yoga practice, and a quiet rest period while watching a nature documentary in the evening on three separate evenings * Participants will have their sleep and heart health measured using a watch and heart rate monitor overnight following each visit

Inclusion Criteria: * Adults 18-40 years * Insufficiently inactive define by the L-CAT (responses below public health physical activity guidelines) * Physical activity is not contraindicated (i.e., no affirmative responses on the Physical Activity Readiness Questionnaire for Everyone (PAR-Q+) * Adults with diagnosed insomnia disorder and score ≥ 10 on the Insomnia Severity Index * Good sleeps a score \< 10 (no history of sleep disorder) * Basic understanding of yoga poses * Access to a smart device (such as a smartphone or tablet) Exclusion Criteria: * Regular yoga practice (\> 60 minutes per week) * Any diagnosed medical condition requiring medical clearance determined 'Yes' response on questions pertaining to a present medical condition(s) via PAR-Q+. This includes, but is not limited to, uncontrolled cardiovascular, metabolic, respiratory, musculoskeletal, neurological, or mental health conditions; recent stroke or concussion; active cancer treatment; and any combination of medical conditions that pose a health risk without physician supervision. All "yes" responses on the PAR-Q+ will be evaluated, and individuals requiring clearance will not be eligible to participate. * Physical limitations and/or mobility restrictions (such as bone, joint, or soft tissue such as muscle, ligament, or tendon that could be made worse by becoming more physically active) via PAR-Q+ * Untreated major psychiatric disorders (e.g. major depression, bipolar disorder, schizophrenia) * Elevated risk for sleep apnea (i.e., STOP-Bang score ≥ 5) * Any other sleep disorders other than insomnia (e.g., sleep apnea, restless legs syndrome, circadian rhythm disorder, etc.) * Current treatment for insomnia (e.g., hypnotic medications, cognitive behavioral therapy for insomnia, etc.) * Current medications that affect heart or blood pressure (i.e., anti-depressants, beta-blockers, etc.) * Current or planned pregnancy within the next 3 months * Overnight shift work defined as regularly working anytime between 00:00 and 6:00am