Is it terrible to leave your LO in a poopy diaper at night???

During the night I feed my LO about every three hours. He wakes up, I breast feed, and he normally passes a lot of gas and poops while I feed him. When he's all done I burp him and keep him up right for about 10-15 min. Then I change his diaper. He's gets super wide awake when I change his diaper so I usually feed him again for about 5 min and he gets tired, and then I put him back to bed.

Once every couple of nights he'll poop again when I feed him the second time, is it really bad to leave his diaper on for about 3 hours? Until I feed and change him again?