Studies show that a brief nap lasting between 15 and 90 minutes is generally healthy, improving brain function, and creativity. In fact, it may even be as restorative as a full night’s sleep.

Naps under 90 minutes can also lower stress levels, the rate of cardiovascular disease, and inflammation—making that lunch-break snooze pretty compelling, especially for people sleep experts call “natural nappers.”

Likely determined by genetics, these habitual nappers account for 40 percent of the population. Rather than waking from a nap confused and groggy, these experienced nappers don’t fall into a deep sleep during their naps. This makes it easier to wake up with increased productivity and alertness, and makes it much easier to turn down a sugar-filled energy drink or jitter-inducing coffee.