I sleep between my twins. I started it in order to make night feedings easy, as my husband has worked nights since before they were born. I fed them side-lying alternately. They are 15 months now and we are no longer breastfeeding, but they still insist on being next to me. It's uncomfortable at times, but it helps me get a good amount of sleep, so I'll keep doing it indefinitely. As the previous poster mentioned, just make sure your older child isn't next to the baby. Oh, and we sleep on two mattresses next to one another. You'll probably need something like that with three bed occupants.