You’re powering through your day like a boss. A presentation here, here, a report there—yup, you’re feeling unstoppable. Nothing can bring you down. That is, until it’s 4 p.m., and all of a sudden, ...

This article was medically reviewed by Raj Dasgupta, M.D., a member of the Prevention Medical Review Board. If you frequently wonder: "Why am I always tired?" you're not alone. Two out of every five ...

Our busy lifestyles can often leave us feeling tired and worn out. But if you’re always yawning or struggling with low energy, there could be hidden reasons causing your fatigue. Question: You have 7 ...

I spent years being utterly exhausted, surviving on caffeine and catnaps. I made a lot of assumptions about why I was tired: Finally, on a routine physical exam, I told my doctor how tired I was.

If you regularly wake up from seven or eight hours of sleep still feeling tired, your instinct might be to start aiming for nine or even 10 hours a night — but that move might not solve the problem.

If you’re always tired, you’re not alone. Forty percent of adults say fatigue interferes with their daily activities at least three days a week, according to the National Sleep Foundation. While ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." There’s no disappointment quite like sleeping for eight hours only to roll out of bed feeling just as ...

Certain zodiac signs pop awake at dawn, cram as many activities as they can into the day, and still have enough energy to meet up with friends at night. For the sleepiest zodiac signs, however, the ...