If I were you, I'd take them to the airport in the early evening, before their regular bedtime. Get check-in and security over with while they are still on a reasonably normal schedule. Then once you are airside, do whatever bits of their normal sleep routine are feasible (change diapers, get into pajamas, etc), and let them sleep in the stroller until you are ready to board. That will give you the fewest disruptions to their actual sleeping time, and IMO is preferable to trying to get to cranky tired babies through security at 10pm.