The data of this study will be collected between May 2022 and December 2022. The research will be carried out with a total of 60 (experimental group=30, control group=30) patients treated for heart failure, myocardial infarction and angina pectoris in the cardiology clinic of a university hospital.~The study was planned as a randomized controlled experiment. Patients meeting the research criteria will be randomly assigned to 30 experimental-30 control groups by randomization method.~Information Form, Richard's Campbell Sleep Scale and commercial ELISA kit will be used as data collection tools in the research.
This study; In order to investigate the effect of progressive relaxation exercises on sleep quality, serotonin and melatonin levels in cardiac patients with sleep problems, a pretest/posttest experimental design study will be conducted with a control group.~The data of this study will be collected between May 2022 and December 2022. The research will be carried out with a total of 60 (experimental group=30, control group=30) patients treated for heart failure, myocardial infarction and angina pectoris in the cardiology clinic of a university hospital.~The data of the study will be collected using the Richard's Campbell Sleep Scale and the Commercial ELISA kit.~Progressive relaxation exercises will be applied to the patients included in the experimental group for 3 consecutive days.~Before relaxation exercises, urine melatonin, serotonin level [5-hydroxyindolacetic acid (5-HIAA) and 6-sulphatoxymelatonin(6-HMS)] measurement and sleep quality will be measured according to the kit procedure.~In the analysis of the data, significance p <0.05 will be accepted. Institutional permission, ethics committee approval, and written consent from the participants were obtained before the study.