Eight hours in bed can look like a full night’s rest. The brain may tell a different story. That is the tension running ...

We've all been there. With a busy morning ahead, you have an extra cup of coffee to help you power through, not realizing that it's one too many. Now instead of being able to focus, you're irritable ...

Add Yahoo as a preferred source to see more of our stories on Google. What a new study says about caffeine. (Getty Creative) (pixelfit via Getty Images) You may wake up in the morning desperate for a ...

Secret side effects of drinking coffee on an empty stomach, according to experts.

Amanda Gardiner investigates what caffeine does to our bodies, from exam-term energy boosts to post-coffee crashes ...

Although coffee can help boost energy and focus in the morning, other drinks like green tea, yerba mate, and more can also ...

Caffeine, a methylxanthine alkaloid ubiquitous in coffee, tea and energy drinks, exerts its primary action through non-selective antagonism of adenosine receptors. By disinhibiting dopaminergic and ...

Too much caffeine can make you a worse driver — not a better one! Most drivers grab a coffee or energy drink before a long ...

A cup of coffee or tea in the morning or an afternoon caffeine pick-me-up is usually fine for most adults. But parents might want to take a closer look at caffeine and other ingredients in the drinks ...

Paraxanthine is being marketed as a smooth Early research suggests paraxanthine may provide an energy boost with fewer jitters and side effects than caffeine. Because research on paraxanthine is still ...

A cup of coffee or tea in the morning or an afternoon caffeine pick-me-up is usually fine for most adults. But parents might want to take a closer look at caffeine and other ingredients in the drinks ...