Please assess the completion status of the following clinical trial:

Trial Title: Phase IIB 2-Period Crossover Polysomnography Study in Participants With Primary Insomnia (MK-4305-006)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2
- Number of Arms: 8.0

Eligibility Criteria:
Inclusion Criteria:~* Has a diagnosis of Primary Insomnia based on sleep history and the investigator's judgment~* Must be willing to stay overnight at a sleep laboratory~* Must be willing to stay in bed for at least 8 hours each night while at the sleep laboratory~* Regular bedtime is between 9 PM and 12 AM (midnight)~Exclusion Criteria:~* Breast feeding, pregnant or planning to become pregnant during the study~* Within the past 6 months before starting the study you have a history of significant cardiovascular disorder such as unstable angina, congestive heart - failure or acute coronary syndrome~* Currently participating or have participated in a study with an investigational compound or device within the last 30 days~* Has traveled across 3 or more time zones in the last 2 weeks or plans on traveling across 3 or more time zones at any time during the study~* Has done shift work within the past 2 weeks~* Has donated blood products within the last 8 weeks~* Has difficulty sleeping due to a medical condition

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 64 Years
- Healthy Volunteers: f

Study Arms:
- Suvorexant 10 mg → Placebo (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received 10 mg suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by dose-matched placebo to suvorexant daily prior to bedtime during Treatment Period 2.
- Placebo → Suvorexant 10 mg (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received dose-matched placebo to suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by 10 mg suvorexant daily prior to bedtime during Treatment Period 2.
- Suvorexant 20 mg → Placebo (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received 20 mg suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by dose-matched placebo to suvorexant daily prior to bedtime during Treatment Period 2.
- Placebo → Suvorexant 20 mg (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received dose-matched placebo to suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by 20 mg suvorexant daily prior to bedtime during Treatment Period 2.
- Suvorexant 40 mg → Placebo (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received 40 mg suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by dose-matched placebo to suvorexant daily prior to bedtime during Treatment Period 2.
- Placebo → Suvorexant 40 mg (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received dose-matched placebo to suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by 40 mg suvorexant daily prior to bedtime during Treatment Period 2.
- Suvorexant 80 mg → Placebo (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received 80 mg suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by dose-matched placebo to suvorexant daily prior to bedtime during Treatment Period 2.
- Placebo → Suvorexant 80 mg (Type: EXPERIMENTAL): After an \~1- to 2-week single-blind placebo run-in period, participants received dose-matched placebo to suvorexant daily prior to bedtime for 4 weeks during Treatment Period 1, followed by a 1-week single-blind placebo washout period, followed by 80 mg suvorexant daily prior to bedtime during Treatment Period 2.

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

Answer: outcome: complete