 - Pittsburgh Sleep Quality Index. This test is performed on the patients in the intervention group at baseline, at discharge from the transplant hospital, at the month of discharge, and at 3, 6, and 12 months, in order to assess the subjective quality of sleep in these patients during the transplant period and their follow-up for one year. It is intended to evaluate the previous present difficulties, the use of hypnotics or other drugs used, and the need for continuity of treatments, as well as the effectiveness of them. The quality of sleep in hospitalized patients is highly documented, but it is not present in this type of patients nor is there any longitudinal follow-up. 