People with obstructive sleep apnea (OSA) typically have low oxygen levels when they sleep because of gaps in their breathing. Blood oxygen during sleep is considered low if levels are below 95%.

Africa is viewed worldwide as a “sleeping gas giant”. The continent’s total gas reserves are almost as large as those of the US. But will local people actually benefit from the export of gas ...

Once oxygen levels drop low enough, the brain sends signals to the body to wake up in order for breathing to resume. Sleep ...