Both of my kids hated co-sleeping. By that I mean they were horrible at it, wanted to nurse every 30min and wanted to be held, kicked, hit, pinched, cried. They both slept TONS better in their own cribs.
I would have loved to co-sleep with them, but in retrospect I am SO HAPPY we let them have the space they desperately needed and wanted.
I do believe some babes just don't do well co-sleeping.
That said, DD still wakes to nurse a couple times a night, I am...