In the first phase, data collection will begin on the first day (n=35) with nurses, and the nurse introductory information form will be collected through face-to-face interviews. Then, at the end of each week during the 4-week period, nurses will complete the "Fatigue Severity Scale" and the "Pittsburgh Sleep Quality Index (PSQI)" four times. This will complete the pre-intervention evaluation.

he researcher will provide approximately 45 minutes of information about relaxation exercises to the nurses. During the application of progressive relaxation exercises, the necessary precautions to be taken during and after the exercise will be explained to the nurses. In the study, a sound recording that includes the PRE will be uploaded to each nurse's phone. The relaxation exercises CD created by the Turkish Psychologists Association will be used for the sound recording. The first section of the CD, which is 10 minutes long, defines deep relaxation, its purpose, and the precautions to be taken during the exercise. The second 30-minute section explains the relaxation exercises with the sound of a stream and verbal instructions. The third 30-minute section contains only relaxation music without any verbal instructions. After the training, nurses will be given the sound recording in CD form. Nurses will be asked to perform the PRE according to the instructions. They will be instructed

The data collection form consists of 12 statements developed by the researchers as a result of the literature review, questioning age, gender, educational status, marital status, working time in the profession, working style, sleep quality and fatigue.

The scale developed by Krup (1989) consists of nine items assessing the general effect of fatigue on daily activities. The Turkish validity and reliability of the scale was performed by Armutlu et al. In the scale, individuals are asked to rate the fatigue they felt during the past week from 1 to 7. Each section is scored between 1 (strongly disagree) and 7 (strongly agree) (add 2 to 6). The total score is calculated by averaging the nine items. The cut-off value for pathological fatigue is set at 4 and above. The lower the total score, the lower the fatigue. Cronbach's alpha coefficient of the scale was 0.94 in the study of Armutlu et al.

expressed in a single item, while others are expressed in a group of several items. Each item score ranges from "0" to "3". The total PDQI score is between 0 and 21. A score above 5 indicates that the sleep quality of the individual is poor. The Cronbach alpha value of the scale was found to be 0.80 in the study of Ağargün et al.

The data collection form consists of 12 statements developed by the researchers as a result of the literature review, questioning age, gender, educational status, marital status, working time in the profession, working style, sleep quality and fatigue.