When I was a little girl I primarily lived at my grandparent's house and had to sleep with my grandmom. I apparently used to roll over so much I would push her out of bed and she'd have to get up and switch sides many times overnight. I'm sure she didn't get much sleep, because I'm going through the same thing now.
I've slept with Livvie since she was born. When she was wee it was a lot easier. We had these things they call sleep positioners which are like little bumpers that you place on either side of the baby to prevent rolling. They also kept her in one spot. As she got larger the bumpers didn't work anymore, and that coincided with her overnight sleep issues developing, so we moved to the futon in the living room. For awhile it worked great. We even got a few nights where she slept for 7 hours straight. Then something happened. I don't know what. All I know is that recently the only way she'll sleep is nestled in one of my arms. This leads to...
My grandmom. Every night now Livvie fusses and kicks me all night trying to get herself some more space. I end up having to stand up over and over to switch her from side to side. I've experimented by standing up and leaving her there by herself to see if she'll sleep better, but eventually she realizes I'm not there and she wakes up. My grandmom is having her revenge. I'm positive of it.
Now one would think that all of this would sour me on co-sleeping, but it's not the case. There's something amazingly beautiful about sleeping with your child and having them reach out to touch you in the night that just can't be beat. Well, maybe not. A full night's sleep could make a good run for it.