Caffeine cutoff before bed

Learn how late-day caffeine affects sleep quality, recovery, and hormone balance, and how to choose a cutoff time that supports training performance and next-day energy. This topic covers practical timing strategies, individual sensitivity, and common caffeine sources that can sabotage sleep without you noticing.

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Why do energy drinks make me tired? The crash mechanics and the best cutoff before bed

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Nov 21, 2025 · 14 min read

Energy drinks can make you tired because caffeine and sugar can create a short-lived spike followed by a “crash,” and caffeine can also disrupt sleep long after the can is empty. If you keep asking “why do energy drinks make me sleepy,” the answer is often a mix of brain chemistry, blood sugar swings, hydration, ...