OK Medical stock CPAP and Auto CPAP machines and their accessories to aid users who supper with sleep apnea. Sleep apnea occurs when the muscles in the back of one's throat relax and therefore narrow one's airway. Sleep Apnea can cause you to wake up from 5 to 30 times and hour - but most likely one won't remember as their body will only wake them for a brief moment to restore oxygen flow. CPAP, APAP, BIPAP machines are all designed to ensure one's airway is open while sleeping so one can get a good nights sleep.