My oldest didn't sleep through the night until about 16 months! He was almost exclusively breastfed. I gave him rice cereal when he was 5 months old. He loved it, and it wasn't long before we started stage 1 foods. He was a great eater.
My youngest was much younger (5 or 6 months?) when he began sleeping through the night. He was breastfed until 4 months and then formula fed. I also gave him rice cereal at 5 months, and he was not interested. I tried a few more times, but he had almost no interest in food until he was 9 months old. He's been eating like a champ ever since.
My boys are, obviously, very different kids. I'm not at all convinced that rice cereal or any other food really has an impact on whether or not a baby sleeps through the night. I really believe that they are hardwired one way or another. When our kids woke in the middle of the night, we fed them. As they got older, we just let them climb in to our bed, and we all went back to sleep.
Hope this answers your question.