Answer:
The unit of analysis is each person who participated in the experiment and who called themselves "morning" or "night" people.
Step-by-step explanation:
Analysis unit is the term that determines the people, beings, objects or events to which the research will directly analyze, that is, the analysis unit is the element that will be analyzed, described and compared during the research. In the case of the question above, we can see that the students who call themselves "morning" or "night" people, are the elements that will be analyzed, therefore, they are the units of analysis.