I Fed the Kids Junk Food Before Bedtime

So, I know all those parenting books say don't let your kids eat sugar and junk food before bedtime. But sometimes, when they've had a long day at school or just need something to cheer them up, I cave in and give them candy or cookies. Last night, after the usual dinner battle of carrots versus peas, I gave in and made hot chocolate with extra marshmallows for my little ones. It felt like a tiny rebellion against all those rules, but they were so happy and even got into bed without much fuss. So, is it worth it to break the rules if everyone ends up smiling? I'm still trying to figure that one out.