Americans drink an average of 587 million cups of coffee a day. So you’d think we’d know how to drink it by now, but as it turns out… we don’t.

AsapSCIENCE is here to tell us how we’ve been drinking coffee all wrong.

Here’s why: The stress hormone cortisol lessens caffeine’s effects on the body. Okay, so what? Well, the hormone is at its highest concentration in the morning, so you’re drinking coffee at the worst possible time.

All you have to do to fix this, is to not drink coffee between the hours of 8 a.m. to 9 a.m. and you’ll be buzzing in no time.