Medical News Today: How long does a cup of coffee keep you awake?

Caffeine stimulates the nervous system. People often consume it to stay alert, but how long do effects last, and how does it impact sleep? This depends on many factors, including the amount of caffeine ingested at once and an individual's metabolism. Learn to estimate how long the effects of caffeine last here.
Source: Health News from Medical News Today - Category: Consumer Health News Tags: Nutrition / Diet Source Type: news