Co-Sleeping

When I was pregnant, I thought I had every detail planned (yeah, right). I swore I would never let my baby sleep with me, I had a pack'n'play, bassinet, and crib. That all changed when my son decided to make an early appearance at 33 weeks and 4 days. I often wonder if he hadn't been premature if I would have stuck to my initial thinking...Fast forward to 4 years later and I still occasionally get a bedtime visitor. The last few nights my son has rolled out of his bed, but it never happens in my bed. I wonder if he is doing it on purpose ;) I need to invest in a bed rail...Not sure he would appreciate Santa bringing that for Christmas.