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Therapist-guided, Internet-delivered cognitive behavioral therapy for insomnia (ICBTi)

The Sleep Course previously developed and evaluated in Australia will be delivered to clients meeting participation criteria. The Sleep Course is four lessons long and is offered with once weekly therapist support for 8 weeks where clients are encouraged to email the assigned therapist for support each week. The therapist reviews client progress in the Course and emails clients once per week on a designated check in date. Sometimes the therapist will call the client. Phone calls are typically made if a client is not logging in or if the therapist feels that a phone call would be a helpful way to provide support.

Insomnia Severity Index (ISI). Includes 7 items rated on a 0 to 4 scale. Higher total scores indicate greater severity of insomnia symptoms over the past two weeks. Scores range from 0 to 28.

The core Consensus Sleep Diary (CSD) consisting of 9 items, will be administered to clients each morning for 7 consecutive days, asking about their sleep the previous night. Participants will record the time they went to bed, time to initiate sleep, time they woke up in the morning, time of final awakening, and time they got out of bed in the morning (in clock). Participants will also record the number (in numbers) and duration of awakenings during the night (in minutes). Using a 6-point Likert scale ranging from 0 to 5, participants will indicate the quality of their sleep with higher scores indicating more restorative sleep quality. An additional open-ended item is added for comments. Two extra questions on napping-extracted from the Expanded Consensus Sleep Diary for Morning- will be included. Using this, participants will record if they napped the previous day (yes/no), and for how long (in minutes). There is no overall score for the scale, each parameter is analyzed separately.

Pittsburgh Sleep Quality Index (PSQI). A 19-item survey rated on a 0 to 3-point scale. This survey is used to assess sleep dysfunction over the past month and produces scores for subjective sleep quality, sleep latency, sleep duration, sleep efficiency, sleep disturbance, use of medication, daytime dysfunction, and higher scores indicate severe difficulties in each area. A sum of the scores from these factors produces a global score between 0-21, where higher global scores indicate more severe sleep disturbances.

Pittsburgh Sleep Quality Index (PSQI- 4 Items). A 4-item survey that assesses quality of sleep. Items on this scale are measured on a 4-point Likert scale ranging from 0-3, and scores range from 0-12, with higher scores indicating worse sleep quality. This measure is used by clinicians to monitor client sleep.

Dysfunctional Beliefs and Attitudes about Sleep- 16 item (DBAS-16) with items rated on a 0 to 10-point scale. Scores range from 0 to 160 with higher scores indicating greater dysfunctional beliefs about sleep.

Patient Health Questionnaire - 9 Item (PHQ-9). Includes 9 items rated 0 to 3. Higher total scores indicate greater severity of depression. Scores range from 0 to 27. Clinical cutoff of ≥10 indicate clinically significant depression.

Patient Health Questionnaire - 4 Item (PHQ-4) involves rating 4 items on a scale from 0 to 3, with scores ranging from 0 to 12. Higher total scores indicate greater severity of depression and anxiety symptoms. Additionally, item #9 of the PHQ-9 is presented alongside the PHQ-4 to monitor client's wellbeing. This item is rated on a scale from 0 to 3, with higher scores indicating more severe self-harm or suicidal ideology. However, the score from this item is not included in the overall PHQ-4 score. This measure is used by clinicians to monitor client's mental health symptoms.

Generalized Anxiety Disorder - 7 Item (GAD-7). Includes 7-items used to assess generalized anxiety disorder. Items are rated on a 0 to 3-point Likert scale. Total score range from 0 to 21, and higher total scores indicate greater severity of anxiety. Clinical cutoff of ≥10 indicates clinically significant anxiety.

Lesson reflection questionnaire - A bespoke 6-item survey that inquires about which lesson and resources clients worked on, effort, understanding, helpfulness, and client successes and challenges over the previous week. This survey is used for clinicians to monitor treatment. No score is calculated or created.

Treatment Satisfaction Survey. A bespoke questionnaire consisting of 15 items with varying response formats measuring treatment satisfaction. The questionnaire utilizes a combination of Likert-scale (5-point (0-4)and 6-point (0-5) ), open-ended, and dichotomous yes/no response options to gauge participants' perception of the course. No overall score is calculated or reported for this questionnaire.

The system collects information on number of lessons completed, number of additional resources accessed, number of emails sent to and received from therapist. Participants' engagement is calculated by averaging the sum from all of the components listed above.

Background information including demographic questions will be collected at screening for descriptive purposes. No scores are calculated.

Sleep and treatment history questions will be administered at screening for descriptive purposes. No scores are calculated based on these questions.