The machine can report various time periods:
- Last night
- Last week
- Last month (Default)
- Last Six months
New CPAP users AHI may be off, volatile breathing can often be interpreted as apneas (False Positives). They often don't sleep well because of the vastly different sleeping experience and lay there wide awake, their more volatile breathing sets off a lot of false positives. There are other explanations as well but without graphs......