Most of us have probably met (and envied) at least one of those mysterious people who never seem to be tired. We’ve sized them up through bleary eyes, and wondered how it is that they don’t look like they spent 30 minutes battling with the snooze button this morning. The answer isn’t necessarily that they have the luxury of more hours to sleep; instead, many of the most well-rested have some simple habits that help them achieve plenty of high-quality rest.

One thing they often have in common? Discipline. The body likes routine, which allows your natural circadian rhythms to kick in. And while it can be tempting to answer one more email or stay for one last round of drinks, well-rested people prioritize sleep the same way they know to do for diet and exercise. “It’s maintaining a regimented sleep/wake cycle and protecting one’s sleep,” says Michael Decker, Ph.D., a sleep specialist and associate professor at Case Western School of Nursing.