A pre-test was administered to all students. In the pre-test application, the Descriptive Information Form, General Health Questionnaire-28, Pittsburgh Sleep Quality Index and Perceived Stress Scale were applied. Experimental and control groups were formed randomly among the students who filled all the scales. Communication groups were established for the students in both groups without being told which group they belonged to. Considering the hours suitable for the experimental group, 8 sessions of laughter therapy were applied for an average of 45 minutes. At the end of the therapy in the last session, a post-test was administered to all of the students. In the post-test application, the Descriptive Information Form, General Health Questionnaire-28, Pittsburgh Sleep Quality Index, and Perceived Stress Scale were applied.

In the pre-test application, the Descriptive Information Form, General Health Questionnaire-28, Pittsburgh Sleep Quality Index, and Perceived Stress Scale were applied. At the end of the therapy in the last session, a post-test was administered to all students. In the post-test application, the Descriptive Information Form, General Health Questionnaire-28, Pittsburgh Sleep Quality Index, and Perceived Stress Scale were applied.

The effect of the Laughter Therapy on nursing students

It was prepared by the researchers in line with the literature in order to collect data about the individual characteristics of the participants. Form; family structure, gender, income status, marital status, health status, age, etc. It consists of 13 items (pretest-posttest design was applied).

It was prepared to detect mental health problems. Individuals who score below 5 on the scale are evaluated as "normal", while individuals who score 5 and above are considered as a "risk group" in terms of mental health (pretest-posttest design was applied).

"Poor sleep quality" is expressed for individuals who score 5 and above from the scale. The scale consists of 24 items that evaluate sleep quality and disorders by scoring over a one-month period (pretest-posttest design was applied).

The scale, which was prepared to evaluate the perceived stress level of the individual, consists of 14 items. High scores obtained from the scale indicate that the person has a high perception of stress(pretest-posttest design was applied).