Why do energy drinks make me tired instead of energized?
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 21, 2025 · 13 min read
Energy drinks promise quick focus and stamina, yet many people feel strangely sleepy or wiped out once the buzz fades. Here is what the science says about caffeine, sugar, sleep, and stress hormones — and how to get real energy without crashing. “When patients ask me ‘why do energy drinks make me tired,’ we walk ...