COVID-19(7) Anxiety(3) mental health(3) independent(2) reduced(2) COVID‐19(2) Infectious disease(2) information(2) progressive muscle relaxation exercises(2) researcher(2) means(2) collected(2) statistically significant(2) Stigma(2) Patient(2) sleep quality(2) experimental group(2) Effect(2) analyzed(2) determine(2) Sleep(2) COVID-19 patient(2) significant difference(2) randomized controlled study(2) inventory(2) carried(2) patients with COVID-19(2) hospital(2) combat(2) scale(2)