The key? “Pay attention to your lips,” he says on the mindbodygreen podcast. Here’s the lip-coffee connection, according to Dr. B. And that morning check-in is key: When you’re sleeping, you’re not drinking any water for eight or some hours (not to mention, you lose water through your skin while you sleep). When you wake up, instead of hydrating first thing in the morning—with two full glasses of water, as Bulsiewicz recommends—you might sleepily pour yourself a strong cup of coffee, which may give you a much-needed jolt of energy, sure, but your body may pay the price: “When you’re dehydrated and the first thing you grab is coffee, that dehydrates you even further,” Bulsiewicz says. That’s not to say you can’t drink any coffee at all if your lips feel a bit parched. Here’s the solution: While the coffee pot is brewing, drink two full glasses of water. And when you finish your cup of joe, pour yourself yet another glass. That way, you can have your coffee and stay hydrated, too.