Sounds Locked to ElectroEncephalogram Phase For the Acceleration of Sleep Onset Time (SLEEPFAST)

Inclusion Criteria: Able to provide informed consent after reading and answering questions in written English Self-report that it takes 30 minutes on average or more to fall asleep Subthreshold to Moderately severe Clinical insomnia symptoms (ISI < 21) Subthreshold to Moderately severe Clinical insomnia (PSQI > 6) Minimal risk for severe Generalized Anxiety Disorder (GAD-7 < 15) Minimal risk for severe Generalized Anxiety Disorder (GAD-7 < 15) Individuals that are not actively being treated for anxiety, insomnia, ADHD or other psychological disorders with medications Self-report of difficulty staying asleep "Moderate," "Severe," or "Very Severe" Self report of waking up in the middle of the night/early morning one or more times per week Exclusion Criteria: Unable to read or understand English Body Mass Index (weight/height ratio) >33 Self-report of being diagnosed with apnea Current or past history of a neurological disorder or psychiatric illness Self-report that it takes less than 30 minutes to fall asleep on average Severe Clinical insomnia symptoms (ISI > 21) Good sleepers (PSQI < 6) High risk for severe Generalized Anxiety Disorder (GAD-7 > 15) Moderate to high risk for alcohol abuse disorder (AUDIT >6) individuals that are actively being treated for anxiety, insomnia, ADHD or other psychological disorders with medications Consumption of more than 4 cups of Caffeinated beverages per day Any caffeine < 6hrs prior to each recording session (e.g. coffee, tea, caffeinated sodas etc.) Any seizures or family history of seizures History of migraine History of brain related injury or unexplained loss of consciousness Cardiac pacemaker or intracranial metal implant Pregnant Taking any anti-depressants, stimulants, medication for hypertension or hypotension and/or cannabis derived products Cochlear implant in either ear Diagnosed with hearing impairment or deafness Works night shifts any night of the week