11month old will sleep from 7.30pm- midnight or 1am and wake for a feed. Then go back down easily after BUT then he wakes every 45mins to 2hrs overnight. And often won't go back to sleep easily each time. I often give up from fatigue and put him in bed with me where he will sleep perfectly until 7am.

How do I get him to stay asleep?

He naps about an hr at 10am and 1.5hr at 2pm.