when you have sleep apnea this is something that is called dipping and non-dipping people who have no apnea in the blue notice 00:07:11 what happens their blood pressures go down at nights here in the 3 A.M to 6 a.m goes down at night they're systolic and diastolic but the people who have apnea they don't get the benefit of that dipping they're not getting the benefit 00:07:25 of rest at night it's because of sympathetic nervous system activity