Tag: Adenosine rebound

According to the National Coffee Association, 62% of Americans drink coffee every day, often seeking an energy boost. However, instead of feeling energized, some people find themselves asking, "Why am I sleepy after drinking iced coffee?". This seemingly counterintuitive reaction has several scientific explanations related to your body's response to caffeine, sugar, and hydration.

According to research, approximately one-third of adults do not get the recommended amount of sleep. If you find yourself asking, why does coffee make me tired but other caffeine doesn't?, the answer may lie in genetics, accompanying ingredients, or the potent 'adenosine rebound' unique to how your body processes caffeine.

According to a 2025 study review, zero-sugar energy drinks can induce metabolic syndrome and insulin resistance comparable to their sugar-laden counterparts in mouse models, which may contribute to fatigue. But beyond that, if you're asking, "Why do zero sugar energy drinks make me tired?", the answer often lies in the ingredients and your body's specific response to them.

Caffeine has a half-life of about five hours, yet many people experience a crash much sooner. The surprising fatigue that follows a shot of espresso can be confusing, but it's often a result of complex biological interactions, including a phenomenon known as adenosine rebound.

According to the CDC, energy drink consumption is significantly high, especially among young adults, yet many consumers report a severe energy drop afterward instead of a sustained boost. So, **why don't I have energy after drinking an energy drink?** The answer lies in a complex combination of physiological responses to high doses of stimulants and sugar.

Approximately 85% of Americans consume caffeine daily, yet many experience the puzzling paradox of feeling more tired after consuming it. Unraveling this mystery requires understanding why does caffeine make me tired in the afternoon, which is crucial for managing your energy levels effectively through a better nutrition diet.