Table 1.

Eligibility criteria for participants

Inclusion

Exclusion

a) Adults (> 18 years of age) b) Diagnosis of insomnia disorder, per DSM-5 c) A stable bed partner willing to participate in the study (i.e. someone with whom the client has lived and shared a bed ≥ 5 nights/week for ≥ 1 month d) Fluent in English

a) Unmanaged psychosis or manic episodes in the past 2 months in either partner b) Untreated sleep disorders other than insomnia (managed sleep disorders such as obstructive sleep apnoea treated with continuous positive airway pressure will be allowed) c) Current substance-use disorder (SUD), or SUD within the last 90 days d) Current or history of domestic violence e) Shift work f) Travel across time zones in the past month prior to commencing treatment g) Pregnancy after the first trimester h) An infant < 1 year of age

There are no exclusion criteria related specifically to the partner, other than exclusions a, c, d, and h

We considered carefully whether to exclude participants taking sleep medications, but decided against this based on the recommendations of Morin et al. [42]. We will, however, track medications throughout the study