Caffeine Half-Life & Sleep Window Calculator

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Calculate how long caffeine from coffee or pre-workouts stays active in your system before sleep.

Caffeine Dose Intake (mg)

Hours Elapsed Before Sleep

Caffeine Timing and Muscle Growth

Caffeine has a half-life of roughly **5 hours** in healthy adults. Drinking strong pre-workout formulas or espresso too close to bedtime blocks adenosine receptors, preventing deep slow-wave sleep. Since muscle repair and growth hormone secretion peak during deep sleep, poor sleep hygiene directly halts gym gains.

Häufig gestellte Fragen

Ideally, cut off all caffeine intake at least 8 to 10 hours before your planned bedtime.

No, liver CYP1A2 enzymes govern caffeine metabolism. Fast metabolizers clear it quickly, while slow metabolizers experience effects much longer.