Last night there wasn't any room in my bed for my head. I was so tired, I didn't notice, and slept with my head hanging off the side.
Since it doesn't look like our children will stay in their own beds any time soon, we're shopping for a bigger bed. If there's any chance it'll help me sleep, I'm sold.
(Saturday update: We bought it today and tonight Miss I fell asleep in her own room rather than the cosleeper. sigh).