According to a report from Dr. Mark Hyman’s website, caffeine is the most widely used psychoactive compound on Earth and can be both a friend and foe to your health.

A 2025 study from Université de Montréal, published in Communications Biology, revealed that consuming caffeine—even just a few hours before bedtime—can increase high-frequency brain activity during sleep. This is especially true for young adults, whose brains are more sensitive to stimulants.

A 2025 meta-analysis by Chen et al. in Nutrients found that caffeine improved attack accuracy, agility, jump height, handgrip strength, and positive plays in volleyball players. The boost was seen with moderate doses before matches.