male or female patients aged 18 to 80 years;

chronic kidney failure;

candidate for kidney transplant with indication for dialysis;

cognitive level sufficient for understanding the procedures and following the instructions;

absence of dementia or treatment-refractory psychiatric diseases leading to an inability to provide informed consent.

and agreement to participate by signing a statement of informed consent.

craniofacial abnormalities;

undergoing active treatment of sleep apnea;

active malignancy;

active alcohol and/or drug abuse;