There’s nothing more irritating than watching your seatmate snooze effortlessly next to you while you queue up another in-flight film and fall further into sleep debt on a red-eye. As a frequent traveler, I know all too well that catching up on deep sleep certainly isn’t feasible for everybody—especially nervous flyers or those with insomnia—but trying to get in at least a few extra hours, even if it’s not a full night’s sleep, is the key to enjoying a better vacation.