Awww I feel for you! Zander was going to bed at about 11pm every night for a long time there, but would wake up reasonably late in the day as well.

To tell you the truth I have no idea how we got around it!! I think Zander just eventually figured it out! Now he goes to bed at about 8pm and gets up at 9am.

We did start a night-time routine which may have helped a bit, but it didn't solve the problem. Now we do dinner, bath, 1/2 an hour later bottle, 1/2 an hour later bed. But that only started at about 8 or 9 months when he went onto solids for dinner.