Ok, this is my experience, so please take it at face value.
I transferred my DS at 22 months as he was able to get out of his cot. Got him a full sized single with a safety rail. And a stair gate on his door. He fell asleep on the floor quite a few times, sometimes quite purposely!
He was also hardly verbal, but we've never had a problem with his receptive language. He got his bed very quickly.
Have you seen anyone about his language? He sounds quite similar to my son (now4) we now have a dx of high functioning autism, which while scary at the time has really helped us access support and also make sure that DS is a happy little boy 
As I said, that might not be relevant to you and feel free to ignore, but if you have concerns, then the sooner you seek support, the better. Starting with a speech and language therapist would be good.
DS now has speech within normal range - for DS it was expressive language rather than receptive language, but we've had to look at how he learns.... It's not NT behaviour and understanding that has helped massively