How long does a cup of coffee keep you awake?
Last reviewed Sun 13 May 2018
By Jon Johnson
Reviewed by Natalie Olsen, RD, LD, ACSM EP-C
Caffeine is a familiar drug that stimulates the nervous system. When it enters the body, caffeine raises the heart rate and blood pressure, increasing energy levels and improving the mood.
Caffeine acts quickly, and many people notice the effects within minutes. They last until the body fully metabolizes the drug. This duration depends on several factors.
https://www.medicalnewstoday.com/articles/321784.php