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There are 3 main types of sleep apnea machines

They’re all commonly called CPAP but some are actually APAP or bi-level machines

• CPAP (continuous positive airway pressure) machines deliver constant airflow while you sleep. Another name for a CPAP machine is a fixed-pressure sleep apnea machine.
• APAP (automatic positive airway pressure) machine is similar to a CPAP machine but it varies the pressure automatically in response to your needs, which can make it a more comfortable sleep apnea machine.
• Bi-level therapy delivers a different pressure for breathing in to the one used for breathing out. This sleep apnea machine is normally reserved for people who need higher pressure. Consult your doctor if you are unsure.