This company based in the UK makes solidly constructed spaces and beds to keep special needs children safe in their rooms. The stand-alone structure, which looks a little like a tall Pack-n-Play, is easy to assemble and is padded all over. It makes a comfortable environment for sleeping, and gives parents peace of mind in knowing their child is tucked safely in.
Each one is made individually and you need to send in specifications to get a quote. They are a UK company, but they also do ship to the US.
Another option to look into is their Travel Pod. Yes, you read that right, a special needs bed that you can pack and take with you when you travel! It's durable and portable so you can now have a safe space for your child to sleep when you're on the road.