Systolic (A) and diastolic (B) blood pressure indices for all 23 patients during wakefulness, non-REMS, and REMS, respectively. Open triangles with dotted lines, AHIhigh (AHI, 10.0 or more); open circles with solid lines, AHIlow (AHI, 10.0 or less). W-BPS, systolic BP index in wakefulness; N-BPS, systolic BP index in non-REMS; R-BPS, systolic BP index in REMS; W-BPD, diastolic BP index in wakefulness; N-BPD, diastolic BP index in non-REMS; R-BPD, diastolic BP index in REMS.