FTM looking for a good nights sleep😅

So my seeet little boy is a horrible sleeper.. he's EBF and we just started solids.. my pediatrician said there is no need to do rice cereal due to his weight (22.5lb) BUT he will not sleep more than 3 hrs.. always heard that rice cereal helps keep them full=sleeps longer=sane mommy lol BUT idk if I want to bc technically he doesn't need it. Dr isn't worried about his weigh bc he is in the 90-99% in all category.. he's just a big baby. But would rice cereal hurt him at all or  even help.. am I a bad mom for considering this?! If I do try.. can I mix it with his baby food ?