Have you ever wondered what happens in your brain while you sleep? Your brain is anything but inactive. Instead, it ...

The bed was level enough to lie in, but the head end was fixed six degrees lower than the feet. Healthy volunteers climbed in ...

Scientists linked sleep struggles with a 26 percent increase in stroke risk, plus other serious brain issues. Learn why and ...

"I stayed up all night, so my head feels as heavy as lead...""When sleep deprivation continues, it feels like there's a fog ...

For the first time, researchers have been able to observe how the pupils react during sleep over a period of several hours. A look under the eyelids showed them that more happens in the brain during ...

Consistently sleeping under seven hours a night disrupts vital bodily functions, increasing risks of cardiovascular disease, ...

REM sleep may involve a surprising energy trade-off, with the brain using more energy even as its fuel supply increases.

For most adults, too little sleep carries serious health risks. But rare natural short sleepers may be biologically wired to ...

During sleep, the brain must achieve a delicate balance: disconnecting from sensory input to allow restorative functions, while remaining alert enough to wake if danger arises. How does it sort ...

An underused part of the Japanese cypress tree could have unexpected value. Early findings suggest its root-derived aroma may ...