Getting to sleep.

Hey ladies, My little boy is 10 months, he used to be great going to sleep, bottle and knock out for the night.. recently it's a BATTLE. Won't settle for around 40 mins, then wakes up 30mins later screaming crying. I'm going to try drop a nap (he has two at the moment) to see if this helps.. Any other suggestions... I'll just add that nothing has changed in our bed time routine at all..