Patton is the only side of the core 4 who almost never stays up late. Virgil's anxiety keeps him awake in to the early hours of the morning, Roman has too many thoughts buzzing around in his head that it makes it hard for him to calm down, and as much as Logan would like to maintain a consistent and optimal sleep schedule, he does have a tendency to stay up late watching analytical video essays and reading about interestings topics. But Patton would always be emotionally exhausted most of the time, and so would be tired enough to consistently fall asleep at the desired time for the ideal amount of sleep. The only reason I think Pat would be awake late at night is if he was helping someone needs else.