The role of drinking coffee new research shows that a cup of coffee lasts for six hours

A new study has found that the stimulating effect of caffeine can last for six hours, the Daily Mail reported. Drinking coffee after 5pm can easily lead to an hour less sleep at night. Because the coffee drinking time is late, it is easy to lead to night sleep disorder, sleep time shortening and sleep quality decline.

In the new study, Christopher Drake, a professor of psychiatry at Wayne State University in the United States, and his colleagues studied the sleep habits of 12 participants who were given 400 milligrams of caffeine (the equivalent of 2 to 3 cups of coffee). During the four-day trial, participants took caffeine tablets, including a placebo, six hours before bed, three hours before going to bed and before turning off the lights. It turns out that drinking a large cup of espresso after 5pm can lead to sleeplessness at night and drowsiness during the day, and even drinking two or three cups of coffee six hours before going to bed can lead to an hour less sleep.

Professor Drake pointed out that many people know that drinking coffee before going to bed can make it hard to fall asleep, but little is known about the fact that drinking coffee in the afternoon can also lead to sleep disorders at night.