Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Severe breathing difficulty, chest pain, blue or gray lips, or stroke signs require emergency care.
New shortness of breath while awake, swelling, fainting, chest discomfort, or neurologic changes should be assessed promptly.
Follow-up is needed after treatment starts or changes.
A sleep clinician may review symptoms, equipment data, oxygen levels, mask fit, and remaining events.
A repeat sleep study or overnight adjustment study may be needed to confirm that treatment is effective and safe.
Continue routine care for heart failure, neurologic disease, kidney disease, or long-term opioid use.
Seek earlier follow-up if symptoms worsen, equipment is difficult to use, or daytime sleepiness continues despite regular treatment.
The article also says
Treatment-emergent central apnea may improve over time, but persistent events require review.
Do not change pressure settings, oxygen flow, or prescription medicines on your own.
Every sign above is quoted from the sofidex article on Central sleep apnea. If you are not sure, err upward — it is always reasonable to be checked.