DS's sleep is a hit or miss these days. When it's good, it's good. When it's bad, it's baaad. This past week, he's been rolling around like crazy from one side of the bed to the other and even getting up on all fours like he wants to crawl (he doesn't crawl yet, but shows sign of wanting to). Then he'll plop back down on his belly and continue rolling. He'll roll over pillows and blankets and just won't settle down unless I nurse him, which I'm trying to stop also. What's going on and what should I do to help him get a more restful/less active night's sleep?

DS is 9 months old and his two bottom teeth, and his two top teeth are currently coming through.