Mindfulness Meditation for Insomnia

Inclusion Criteria: * Age 18 years and older; * Chronic insomnia (≥ 3 nights/week, for ≥ 3 months), defined by DSM-V or ICSD-3; * Have a primary complaint of difficulty falling asleep (sleep-onset insomnia) with self-reported sleep onset latency \>20 min; * Insomnia Severity Index score ≥ 15; * Speak and understand English; * Have a smart device (phone or tablet) for mobile app installation Exclusion Criteria: * Current diagnosis of sleep disorders other than insomnia (e.g., narcolepsy, restless leg syndrome, REM sleep behavior disorder, etc.); * Shift worker or routine night shifts; * Women with pregnancy or breastfeeding; * Regular (defined as twice a week or more) practice of mind-body interventions; * Patients with pace-maker or routinely using cardiovascular medications that have effects on heart rates (i.e., beta-blockers); * Neurological disorders (e.g. epilepsy, dementia, stroke, Parkinson's disease, neuroinfections, brain tumors, etc.) or current diagnosis of comorbid psychotic, substance use, and trauma-related disorders; * Currently under medications with sleep changing effects (e.g., anxiolytics/benzodiazepines, selective serotonin reuptake inhibitors, hypnotics, etc.); * Hearing impairment or loss. Participants will be asked to report any medication for at least 2 weeks prior to study onset and during the study period.