Caffeine is known to increase alertness. It works by blocking the effects of adenosine, a brain chemical that makes you feel tired. At the same time, it triggers the release of adrenaline, the “fight-or-flight” hormone associated with increased energy ( 8 ).

Does caffeine make you energetic?

Caffeine is a familiar drug that stimulates the nervous system. When it enters the body, caffeine raises the heart rate and blood pressure, increasing energy levels and improving the mood. Caffeine acts quickly, and many people notice the effects within minutes.

Can coffee make you hyper?

Caffeine can make you feel hyper. Caffeine may boost a person's energy, but a lot of caffeine can also cause other, not-so-great effects. Too much caffeine can: make you feel nervous or jumpy.