Sleep does more than fight fatigue. Doctors explain how a chronic lack of sleep weakens immunity, affects vaccine response, ...

Doctors and sleep specialists warn that regularly sleeping less than six hours per night may affect far more than energy ...

Consequently, we humans, as well as all other organisms, developed a circadian rhythm in our physiology and behaviors with ...

Stress and sleep are closely related. Stress raises cortisol levels, delays sleep, reduces sleep quality, and may increase the likelihood of nightmares. A lack of sleep can also affect day-to-day ...

Blame it on the Industrial Revolution. Or maybe on the light bulb. But ever since man met machine, sleep has been on the skids. In 2001, 38 percent of U.S. adults said they were sleeping less than ...

From babies who cry through the night to teens who sleep all morning to older adults who just can’t seem to catch any z’s, sleep patterns and the amount of sleep you need change throughout our lives.