so I did some research and apparently apneas and
cpap can stop the cerebral spine fluid
flow at the c2 - only the venous
flow building intracranial pressure ( from research on normal healthy awake males using cpap) , So I took it as a good thing and even started yoga which is meant to improve csf flow, Now I hear this noise more often - when truning over in bed and even walking on flat surfaces but not if I am still.