CPAP machines are devices used by patients, often at home, to help treat sleep apnea. As such, CPAP machines are a method of respiratory ventilation that helps patients by delivering a consistent stream of air through a face mask. The CPAP machine is designed to overcome problems with sleep apnea, which causes the patient's airways to become restricted, leading to difficulties in sleeping. CPAP machines help to keep airways unrestricted, and reduce the chances for sleep disturbance. The latest CPAP machines are computer operated to modify airflow as needed to increase patient comfort.

There are a wide variety of CPAP machines available, of vaying sizes and costs. The most basic CPAP machines are often the largest, and are designed mainly for in home use. Smaller CPAP machines are also available and provide greater mobility, including use during travel if needed. When looking for a CPAP machine, be sure to consider it size and cost, but also how noisy it is and what type of power supply is needed. Often CPAP machines can be found through online retailers at significant discounts to offline medical device stores.

CPAP machines are often one of the primary treatment methods for sleep disorders, and although some patients initially resist using them because of their bulk and appearance, most patients are able to adjust to using a CPAP machine within a few weeks to a month. Many patients report improvements in sleep when using a CPAP machine their very first evening of usage. Note that generally CPAP machines are only available with a physician's prescription, since the machine must be set up for the proper airflow based on the patient's size, health and condition.