People who get more deep sleep appear less likely to develop Alzheimer's. That may be because this phase of sleep allows the brain to clear out waste products.
There's growing evidence that a lack of deep sleep increases the risk of Alzheimer's disease. Scientists say that's because during deep sleep, the brain removes toxins associated with Alzheimer's.
Four astronauts are flying to the International Space Station aboard SpaceX's Dragon crew capsule. The mission is the first of what NASA hopes are many.
Dr. Vivek Murthy, co-chair of President-elect Joe Biden's coronavirus advisory board, says past lockdowns functioned like a "blunt axe" that led to spotty compliance and "little public health gain."
The country set another record for daily infections. America is the world leader in COVID-19 fatalities. President-elect Joe Biden expressed alarm and urged the Trump administration to take action.
Young adults are preparing to travel home for Thanksgiving, but the coronavirus is making things complicated. Epidemiologists say there are things families can to do reduce the risk of infection.