My wife's CPAP readings were averaging an AHI of 10.5 a night over a many months and the consensus was that due to Her medical condition it was probably the best results possible. because of CA's and CSR's She runs the pressure from 6 to 8.4. She always used Her ipad right up to bed time at 9pm but then decided to trial putting it away at least 3 hours before bed time. Amazingly Her nightly average AHI has dropped to 5.4 with much lower CA readings and less CSR events. It works for Her so hope it helps someone else having the same problems.