Comparing Acoustic Resonance Therapy (ART) vs. Cognitive Behavioral Therapy for Insomnia (CBT-I)

Inclusion Criteria:

* Adult subjects, 22 years of age and older at screening
* Moderate-to-severe insomnia disorder, as defined by the International Classification of Sleep Disorders (ICSD-3)\* and the Insomnia Severity Index (ISI) and have been diagnosed for more than three months.
* Not pregnant by subject self-report at time of consent.
* Have the ability to provide informed consent.
* Have the ability to complete all aspects of this trial.
* Have access to an iOS mobile device (iPhone X or above).
* Have no contraindicating comorbid health condition that would interfere with the proper use of the SONU Headband system, as determined by the clinical investigators.
* Participants who are taking sleep-aiding pills must agree to no changes to medication and dosage during the study.

  * According to the third edition of the International Classification of Sleep Disorders (ICSD-3), insomnia is characterized by difficulty in either initiating sleep, maintaining sleep continuity, or poor sleep quality

Exclusion Criteria:

* Patients who are unable to commit to avoiding the consumption of alcohol during the study.
* Patients who are unable to commit to avoid consumption of caffeine after 12 pm (noon).
* Patients who have a clinically significant or unstable medical or surgical condition.
* Participants using pacemakers or cardiac monitors.
* Participants with severe physical illness or immediately post-surgery
* Participants with severe mental disorders, such as schizophrenia, severe major depression, severe anxiety, bipolar disorder, dementia, substance use disorder, or severe neurological diseases such as a seizure, stroke, or Parkinson's disease.
* Participants with other serious sleep disorders, such as severe obstructive sleep apnea.
* Participants who are unable to attend regular follow-up evaluations.
* Any unstable medical or mental health condition as determined by the physician investigator.