Dr. Somers and other researchers think sleep apnea may affect some forms of heart disease because of the drop in oxygen that occurs during sleep apnea.

CNN: Sleep apnea: Can it cause heart disease?

By studying the climbers, six of whom reached the summit, the researchers hope to gain insight into heart failure, lung disease and sleep apnea all conditions related to a low-oxygen, or hypoxic, state.

WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body

"The AAP recognizes that monitors may be helpful to allow rapid recognition of apnea, airway obstruction, respiratory failure, interruption of supplemental oxygen supply, or failure of mechanical respiratory support, " the group states.

ENGADGET: Researchers use wireless network to monitor breathing, could save lives