Co-sleeping?

DH likes the idea of napping with Alan in our bed.
Although I don't object to co-sleeping in general, I'm not sure about *our* bed - we have a foam matteress pad, the bottom sheet sometimes slips off on one corner and we have lots of pillows and blankets. I'm just afraid of him getting caught or rolled over on.

Has anyone used the snuggle nest http://organicbebe.com/snugglenest.asp ? Would this solve our problems?