Guides and explainers
Caffeine and sleep articles
Evidence-led guides that help you understand caffeine timing and make better use of the calculator's estimates.
When to stop caffeine before sleep
Learn how caffeine half-life, dose, timing and individual sensitivity affect a practical caffeine cutoff before bedtime.
Read articleHow long does 200 mg of caffeine last?
Follow a worked caffeine half-life timeline for a 200 mg dose and see how timing and metabolism change the estimate.
Read articleCan coffee at 3 PM affect your sleep?
See how much caffeine could remain by bedtime after a mid-afternoon coffee and learn how to test a better cutoff.
Read articleHow long does pre-workout caffeine stay in your system?
Estimate how a 150–300 mg pre-workout dose declines and what an evening training session could mean for bedtime.
Read article