Sleep Therapy Made Simple
These devices can look similar. The way they support your breathing is what sets them apart. Get to know the therapy behind each name.
Explore the three typesContinuous positive airway pressure
React Health G3 X
CPAP / auto-adjusting CPAP example
CPAP holds the upper airway open with one prescribed pressure. It is a common treatment for obstructive sleep apnea, where the airway repeatedly narrows or closes during sleep.
Many devices also offer APAP, which adjusts pressure within a prescribed range.
Bilevel positive airway pressure
React Health Luna G3 Bilevel 25A
Auto-adjusting bilevel example
Bilevel delivers higher pressure as you breathe in and lower pressure as you breathe out. A clinician may prescribe it when separate pressure levels are needed, including for some people who struggle with CPAP.
You may see BPAP or bilevel on your prescription. BiPAP is a brand name often used for this category.
Adaptive servo-ventilation
ResMed AirCurve 10 ASV
Adaptive servo-ventilation example
ASV is a specialized form of bilevel therapy that adjusts pressure support as breathing changes. A sleep specialist may prescribe it for certain central or mixed apneas, or periodic breathing.
Central apnea involves pauses in the signal to breathe. ASV requires an individual assessment, including heart health.
Devices shown are examples of each category. Your prescribed therapy determines the device and settings; photos do not indicate current stock or a specific device you will receive.
See the difference
Select a therapy to explore its pressure pattern. All three deliver air through a mask while you sleep.
CPAP
The prescribed pressure stays at one level as you breathe in and out. Ramp and exhalation-relief comfort features can modify how that pressure feels.
These simplified sketches show general therapy concepts, not actual device readings or suggested settings. Automatic modes and comfort features can change the pattern.
One more name to know
APAP means auto-adjusting positive airway pressure. It adjusts the treatment pressure within the range set by your clinician as your airway needs change during sleep.
One prescribed treatment pressure.
Pressure adjusts within a prescribed range.
Explore mask fit, comfort, cleaning, and device guides.
General education. Follow your clinician’s treatment plan and the instructions for your device. Sources checked October 19, 2026.
Product photography: React Health and ResMed. Models shown: React Health G3 X, React Health Luna G3 Bilevel 25A, and ResMed AirCurve 10 ASV. BiPAP is a Philips Respironics trademark; bilevel is the general therapy term.
