CPAP devices offer ramp features that start with lower pressure and gradually increase as you fall asleep

https://www.scribd.com/document/997941580/How-a-Sleep-Apnea-Oral-Appliance-Is-Fitted-Step-by-Step-Overview-207415

CPAP devices offer ramp features that start with lower pressure and gradually increase as you fall asleep, helping new users adapt to therapy more easily.