Known sleep apnea in continuous positive airway pressure(CPAP) treatment.

Known mild sleep apnea (AHI 5-14) after the sleep apnea measurement.

Participants with central apnea (\> 50 % of central apnea episodes in the AHI ≥ 15 group.) or Cheyne Stokes after the sleep apnea measurement.

\< 4 hours of recording (ApneaLink)

Known coronary arterial disease with previous revascularization (PCI or CABG)

Sleep Apnea, Coronary Atherosclerosis and Heart Failure in Diabetes Patients With Nephropathy