CPAP machines give steady air pressure. This keeps airways open during sleep. They work well for sleep apnea. BiPAP machines offer two pressure levels. Higher pressure aids breathing in. Lower pressure helps breathing out. This is good for COPD and breathing trouble. Doctors suggest both machines. They improve oxygen flow. They reduce tiredness. They help people sleep better. https://www.tumblr.com/stevesmith1050609/793114293717630976/cpap-bipap-for-rent-or-sale-affordable-home?source=share