Doctors Are Shocked by What This Common Drink Does Overnight

The Timing Revolution

Sleep researchers and many progressive physicians now focus not just on how much coffee people consume but when. The ‘caffeine half-life’ — the time it takes for half of a dose of caffeine to be metabolized — is approximately five to six hours in most adults.




This means a coffee consumed at 3pm still has meaningful caffeine activity at 8 or 9pm. Shifting coffee consumption to the morning hours and setting a firm cutoff time — typically noon for most people — can improve sleep quality significantly without requiring abstinence.