Use of a CO2 clamp and or CPAP to stabilize respiration in patients with combined central and obstructive sleep apnoea

This study is looking at two treatments to help people who stop breathing during sleep — a problem called sleep apnoea. Some people have both central sleep apnoea (where the brain doesn't send the right signals to breathe) and obstructive sleep apnoea (where the airway is blocked). Researchers are testing whether using extra carbon dioxide (CO2) and a breathing device called CPAP can help stabilize breathing during sleep. You may be eligible if: - You have been diagnosed with central and/or obstructive sleep apnoea - Your condition has been stable for at least the past month - You are willing and able to give informed consent You may NOT be eligible if: - You have a significant psychiatric (mental health) condition - You have claustrophobia (fear of enclosed spaces) - You are unable to tolerate wearing a CPAP mask overnight Talk to your doctor about whether this trial might be right for you.