Participants in the control group will not receive any therapeutic intervention during the study period. To equalize the time and attention provided to the intervention group, participants will be instructed to lie down in a comfortable position for twenty to thirty minutes once a day, before going to bed, for a total of six weeks, without performing any relaxation technique or physical activity.

They will be asked to record each daily session in an activity log and will be instructed not to miss more than two sessions per week. Participants will also be asked to refrain from receiving any additional complementary or mind-body therapies that promote relaxation-such as acupuncture, massage, meditation, or other similar practices-throughout the study period. No restrictions will be placed on their usual daily routines or lifestyle habits.

After completion of all assessments at the end of the study, participants in the control group will be provided with information about progressive m

At the beginning of the study, participants will be verbally informed about the progressive muscle relaxation technique, its method of application, and associated breathing techniques. Following this introductory session, twenty- to thirty-minute video and audio recordings prepared by the Turkish Psychologists Association, featuring music-assisted progressive muscle relaxation exercises, will be delivered to participants via a smartphone application.

Participants will be instructed to follow the video and audio recordings once a day, before going to bed, for a period of six weeks. A follow-up meeting will be scheduled two weeks after the initial session to monitor participant compliance, answer questions, and reinforce proper technique.

Participants will be asked to record each session in an activity log and will be instructed not to skip more than two sessions per week. In addition, they will be asked to refrain from receiving any complementary or relaxation-based therapies, such a

No therapeutic intervention will be performed on participants in the control group after baseline assessment. To equalize the time and attention provided to the intervention group, participants in the control group will be asked to lie down in a comfortable position for twenty to thirty minutes once a day before going to bed for six weeks, without engaging in any relaxation technique or physical activity. They will be instructed to record these daily sessions in an activity log and will be asked not to miss more than two sessions per week.

Participants will also be asked to refrain from receiving any additional complementary therapies that promote relaxation-such as acupuncture, massage, and other mind-body techniques-throughout the study period. No restrictions will be placed on their usual daily routines or lifestyle habits.

After completion of all study assessments, participants in the control group will be informed about progressive muscle relaxation techniques, including their a

The scale designed to assess sleep quality consists of a total of 24 questions. Nineteen of these questions are answered by the individual, while five are answered by their spouse or roommate. The last five questions are not included in the scoring. The total scale score, ranging from 0 to 21, is obtained by summing the scores of seven subcomponents classified as subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbance, sleep medication use, and daytime dysfunction. A total score of ≤5 indicates good sleep quality, while a score >5 indicates impaired sleep quality.

The Nottingham Health Profile aims to assess quality of life. It is divided into two sections. The first section consists of six sub-dimensions and 38 items: pain, emotional reactions, sleep, social isolation, physical activity, and energy level. Each sub-dimension score ranges from 0 to 100, and the total score for the first section ranges from 0 to 600. The second section consists of seven items containing questions about areas of life affected by health status. The total score for the second section ranges from 0 to 7. In the evaluation of the scale, low scores are interpreted as minimal impact from the disease, while high scores indicate significant impact.

The Chalder Fatigue Scale assesses the fatigue experienced by individuals over the past month. It consists of 11 items. A high total score on the scale indicates a high level of fatigue.

The Depression Anxiety Stress-21 Scale is a shortened version of the Depression Anxiety Stress-42 Scale. It consists of seven items measuring depression, stress, and anxiety. The scale cannot be expressed as a single score; the scores from the three subscales are evaluated separately.

The scale contains nine items scored from 1 (strongly disagree) to 7 (strongly agree). The total score is calculated as the mean of all items. Scores <4 indicate absence of fatigue, whereas scores ≥4 indicate clinically relevant fatigue; higher values denote greater fatigue severity.