Search for a Psychology journal that investigates the relationship between sleep and memory. It should include specific variables. The article must be an empirical study and peer reviewed.

To find a psychology journal article that investigates the relationship between sleep and memory, follows specific variables, and is an empirical study peer-reviewed, you can follow these steps:

1. Start by accessing a reputable academic database or search engine focused on psychology, such as PsycINFO, PubMed, or Google Scholar.

2. Begin your search by using relevant keywords or terms, such as "sleep and memory," "relationship between sleep and memory," or "sleep and memory empirical study."

3. Specify additional variables or criteria you are interested in, such as the specific population being studied (e.g., age group, gender), type of memory (e.g., episodic, procedural), or sleep-related factors (e.g., sleep duration, sleep quality).

4. To filter your search for empirical studies in peer-reviewed journals, navigate to the search options or filters provided by the chosen database. Look for options like "article type," "methodology," or "publication type."

5. Select the option for "empirical study" or "research article" to ensure you are considering only research-based articles rather than reviews, commentaries, or theoretical papers.

6. Additionally, choose the option for "peer-reviewed" or "refereed" to ensure the article has undergone a rigorous review process by experts in the field.

7. Refine your search further by limiting the publication date range if necessary, depending on how recent you want the articles to be.

8. Once you have applied the appropriate filters and entered your criteria, click the search button to generate the results.

9. Scan through the list of articles generated by your search and read the titles, abstracts, and keywords to determine if they are relevant to your topic and criteria. You can also check if the articles mention the specific variables you are interested in.

10. Click on the selected article's title to access the full text and read the study to gain a comprehensive understanding of their research methods, variables, and findings.

Remember, the process might vary slightly depending on the database or search engine you are using, but these general steps should help you find a psychology journal article that investigates the relationship between sleep and memory, includes specific variables, is an empirical study, and is peer-reviewed.