Please assess the completion status of the following clinical trial:

Trial Title: Brief Behavioral Insomnia Treatment Study

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Veterans between the ages of 18-75 years.~* Meet DSM-5 Criteria for Insomnia Disorder.~* Able attend in-person appointments at the San Francisco VA Medical Center~* The investigators will not exclude individuals who are taking insomnia or antidepressant medications, provided they have been stable on these medications for at least one month and still meet criteria for Insomnia Disorder as described above.~  * Specifically, individuals receiving benzodiazepine or benzodiazepine receptor agonists, anticonvulsants, atypical antipsychotic medication, or non-SSRI antidepressant medications such as trazodone will not be excluded provided they meet the criteria described above.~* The investigators will not exclude Veterans receiving any type of psychotherapy, provided they have received this treatment for at least three months and do not plan to discontinue this treatment during the BBTI trial.~  * However, individual who need to start a new type of psychotherapy during the course of the treatment will be excluded, or they will need to wait three months in order to enroll in the trial.~* The investigators will not exclude individuals with TBI.~* The investigators will not exclude individuals with chronic pain.~* The investigators will not exclude individuals based on any other mental health condition, including posttraumatic stress disorder and depression.~Exclusion Criteria:~* Conditions that may be associated with comorbid insomnia, including a lifetime history of any psychiatric disorder with psychotic features or bipolar disorder, and alcohol or drug dependence within the past year.~* Individuals who meet criteria for alcohol or drug abuse will be asked to reduce alcohol to recommended limits during the course of the study and/or refrain from drug use in order to be included.~* Veterans with suicidal or homicidal ideation.~* Veterans who are pregnant, due to the biological impact of pregnancy on sleep.~* Veterans who work night or rotating shifts.~* Veterans with untreated moderate to severe sleep apnea (those receiving treatment will not be excluded from the study).

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Brief Behavioral Treatment for Insomnia (Type: EXPERIMENTAL): Participants will receive 4 weeks of Brief Behavioral Treatment for Insomnia (BBTI). BBTI consists of two in-person sessions, with the two other sessions conducted via telephone. BBTI emphasizes behavioral elements of insomnia treatment. Treatment begins with sleep education and discussion of the biological rhythms that influence sleep cycles. Next, a series of interventions are employed that are derived from sleep restriction and stimulus control techniques.
- Progressive Muscle Relaxation (Type: ACTIVE_COMPARATOR): Participants will receive 4 weeks of progressive muscle relaxation training (PMRT). PMRT consists of two in-person and two phone sessions. Treatment begins with training on muscle tensing and relaxing, and advances to progressively more efficient tensing-relaxing and passive relaxation exercises. Sessions are employed that teach techniques and problem-solve barriers to the use of PMRT.

Based on this trial design, predict the completion outcome and termination type (if applicable).