Jack used to love to be rocked to sleep then one day he just decided he didn't want it anymore, he would wiggle and push against me until I put him in his cot. They do grow out of it
Yup I totally agree. Happened with both my kids

Can't remember when it happened with DS though - but DD doesn't need to be rocked to sleep anymore, and hasn't for ... maybe a month ? She's 1 today. So its not tooooo much longer for you

Now we are onto the put in cot and stroke back/pat bottom to get off to sleep. DS only needs us to sit there with him and he falls asleep at night.