Brew your coffee — but don’t drink it yet.

Many things naturally happen to our bodies when we wake up. In addition to developing a magical ability to ignore loud noises like an alarm, our bodies also start pumping out the hormone cortisol, a sort of natural caffeine. Most people’s cortisol levels peak sometime between 8:00 and 9:00 in the morning.

Instead of hopping aboard this wakefulness train, however, coffee consumed at this time may actually blunt cortisol’s natural effects, according to Stephen Miller, a Ph.D. candidate at the Uniformed Services University of the Health Sciences in Bethesda, Maryland. Instead of caffeinating during this window, Miller recommends holding off for an hour after you awaken.