H.P.
If he only wants it to go to sleep, then it might just be about intimacy and comforting. Hold him and just have quiet time, looking into his eyes and talking in a quiet voice (if at all--it's okay to be silent). Take that time to connect with him...speak to him without words. He'll get it. If he just needs something in his mouth after that, give him a pacifier or a favorite blanket or toy that's just for bedtime.