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%.

Low oxygen levels in the blood can alter the genetic makeup of key immune cells, weakening the body's ability to fight ...

High blood pressure, which affects nearly half of U.S. adults, has earned the nickname “silent killer” for a reason — it ...

"Excessive fluctuations could be a sign of vascular aging that contributes to brain injury" said gerontologist Daniel Nation.