Patients will be selected in two ways:
1. Intervention group: patients with COPD or idiopathic fibrosis following rehabilitation program in our center, who meet the inclusion criteria will be invited to participate in the survey and answer the questionnaires during the first week and again eight weeks after the start of the rehabilitation program.
2. Control group: patients with COPD or idiopathic fibrosis who do not perform any regular physical activity will be invited to participate in the survey and answer the questionnaires.
The questionnaires are validated and the time allowed for completion is 45 minutes. The questionnaires will assess sleep quality, anxiety and symptoms of depression.
