Help!!!

My LO won't sleep at night... I'm laying here writing as yet again I'm up for him. He went to bed at 9, he woke up at 10-11, 12-230, 330- ? (Still up at 415)... we did our bedtime routine (calm, pj's, chitchat, bf, story, "questions", and prayer), he had some rice cereal about 815,  we used to do cio but it didn't work.... I'm at the end of my rope. This happens regularly, not this bad, but nonetheless regularly. And on top of that it takes me time to go back to sleep bc I'm up w him... I NEED SLEEP!!!!! 😩😰😴