The goal of this clinical trial is to examine the effect of hot water foot bath on the patients' pain severity and sleep quality levels on the night of the lumbar degenerative disc surgery. The main hypotheses are: * H1=Pain severity of the patients who applied footbath is lower than the patients who did not. * H2=The sleep quality of the patients who applied footbath is higher than the patients who did not. Participants will be asked to keep their feet in 42oC hot water for 20 minutes on the night of the day of surgery. If there is a comparison group: Researchers will compare control group to see if there is any difference on the pain severity and sleep quality of the patients.