Question 1

How long does caffeine stay in your system?

Accepted Answer

Caffeine has an average half-life of 5-6 hours, meaning half the caffeine is still in your system after that time. It takes about 10-12 hours for caffeine to be fully eliminated. A coffee at 2 PM still has ~25% of its caffeine active at 10 PM.

Question 2

When should I stop drinking coffee for better sleep?

Accepted Answer

Research suggests stopping caffeine intake 8-10 hours before bedtime for optimal sleep quality. If you go to bed at 10 PM, your last coffee should be before 12-2 PM. Even if you fall asleep fine, caffeine reduces deep sleep stages.

Caffeine Half-Life
Calculator

☕ What did you drink?

🕐 When?

Frequently Asked Questions

Caffeine Half-Life
Calculator

☕ What did you drink?

🕐 When?

Frequently Asked Questions

Caffeine Half-LifeCalculator

☕ What did you drink?

🕐 When?

Frequently Asked Questions

Caffeine Half-LifeCalculator

☕ What did you drink?

🕐 When?

Frequently Asked Questions

Caffeine Half-Life
Calculator

Caffeine Half-Life
Calculator