Can caffeine make up for a lack of sleep?

Caffeine can certainly mask the effects of sleep deprivation by waking you up, but you still need real sleep to refresh your mind and body. In this video, sleep expert Michael Breus, PhD, explains why caffeine cannot make up for a lack of sleep.

Muddled thinking, poor reflexes (don’t get behind the wheel!), memory problems—and that’s the short list.

You probably knew about the effects of having caffeine late in the day. But what about these other causes of sleeplessness?

Desmoid tumors are noncancerous and do not metastasize, but they can invade nearby tissues and structures.

The relationship between sleep and heart health may be a two-way street. Here’s what you need to know to improve both.

Constant caffeine, skipped workouts and other perils of the late-night worker.