We finally purchased Austin a new twin sized bed. We went with a twin XL so he will be able to use if for a long time even if he ends up being tall. He was so excited that when Dustin brought the matress in the living room he pushed it down on the floor and went and got his blankie to snuggle up on it and try it out.
He has done okay with it at night, he has been in it almost a week now and we have a had a couple of nights where he woke up multiple times, but most nights he has slept all the way through and had no issues. He has remained in the bed at all times and waits for Dustin or I to come in for him, so that has been nice.