Survey data showed students who drank one cup of coffee a day had a GPA of 3.41, compared to students who drank two cups a day at 3.39, reports USA Today.

Jeffrey Ellenbogen, assistant professor of neurology, sleep medicine at Johns Hopkins University, is not affiliated with the survey but said daily caffeine use could definitely impact a student’s performance.

“If one is a daily consumer of caffeine or feels like they can’t function without it, that’s a time to take a big step back and look at what is the quality of sleep and quantity of sleep,” Ellenbogen said.