My 15 month old is rocked / held to sleep. I'm fine with this as he sleeps well and don't want to sleep train. My issue is he is resisting sleep every nap/bedtime, he fights to get off and has recently learned that throwing his dummy means going back downstairs to reset sleep routine. If I put him in cot he plays for 15 mins then cries his heart out so not an option. How do I even fix this!?