Continuous Positive Airways Pressure,CPAP machine is used in helping people with sleep apnea breath more easily and regularly every night while they are sleeping. A CPAP machine increases the air pressure in your throat to prevent your airways from collapsing when you inhale. It also decreases snoring (which will help your partner snooze better at night). The machine has a filter and small tank of water, which essentially works as a humidifier. There's a tube that connects the unit to a mask that you place over your face while you sleep, and a chin strap keeps it in place.