S.H.
every single child I've known....has gone thru the head-banging stage. It's a pain to watch!
I have seen this happen with non-vocal & very vocal children. My only recommendation would be: please have him assessed by the local school district &/or dr to rule out other issues.
& as for the bed: if he can climb out, then it is time to remove the crib. One slip is all it takes to put him in the hospital. In order for him to learn to stay on his bed, you will need to create your discipline plan. I highly recommend watching the "1-2-3 Magic" video. Been using it for years!