Treating Insomnia in Mild Cognitive Impairment

Inclusion Criteria: * Aged 60 years or older * Speak and read English * Clinical diagnosis of MCI or Subjective Cognitive Impairment (SCI)-a perceived gradual worsening in cognitive ability relative to one's younger self, or peer group-reported by either the participant or informant * Reported insomnia symptoms (sleep-onset and/or sleep maintenance) that cause significant distress or impairment in social, occupational, or other areas of functioning over the past three months * Have access to an Internet-enabled computer or tablet at home, or ability to connect a BIDMC-provided tablet to the internet, with private space to complete cognitive testing * Capable of and willing to provide written informed consent Exclusion Criteria: * Evidence of significant cognitive impairment or dementia * Contraindications for TMS or MRI * Current psychological treatment for insomnia * Uncontrolled moderate-to-severe obstructive sleep apnea or other untreated sleep disorder (e.g., Restless Leg Syndrome, Periodic Limb Movement Disorder, parasomnia). Sleep apnea that is managed (e.g., regular use of a CPAP) and stable for ≥3 months is allowed. * Diagnosis of Parkinson's disease, Huntington's disease, Lewy-Body disease, or other neurological condition known to impact sleep * Current diagnosis of major psychiatric disorder (well-controlled depression or anxiety is permitted) * Current opiate/opioid use * Alcohol or drug abuse within the past year * Irregular sleep schedule (bedtime before 8pm/after 2am OR wake time before 4am/after 10am), unless participant states they are willing and able to change if prompted.