Table 1.

Eligibility criteria

Inclusion	Exclusion
1. DSM-5 insomnia disorder	1. Sleep disorders (other than insomnia), for example, restless legs syndrome, narcolepsy, central sleep apnea, and untreated obstructive sleep apnea (OSA; treated OSA was not exclusionary)
2. Age 18 years or older
	2. Bipolar disorder
	3. Epilepsy or other seizure disorder
	4. High depression chronicity

Insomnia disorder was survey assessed and determined per DSM-5 criteria. Exclusionary items were reported by patients on an online screener. Specifically, patients were asked to report diagnosed sleep disorders, diagnosed bipolar, and diagnosed seizure disorders. Depression chronicity was operationalized as self-reported daily or near-daily depressed mood and anhedonia.