Guide
Caffeine half-life: why timing matters more than you think
Half-life is the time it takes for caffeine in your body to drop by 50%. It shapes sleep and next-day cravings.
Why it matters
- - Late-day caffeine can persist into bedtime and reduce deep sleep.
- - Poor sleep amplifies fatigue and mood withdrawal symptoms.
- - Earlier intake makes tapering easier without changing your whole schedule.
Practical takeaway
When tapering, keep your caffeine earlier, then reduce quantity. That combination tends to reduce headaches and sleep disruption.