I moved DS from a hammock by my bed (where he sttn from very young) to his cot in the adjoining room (not even a door there, just an empty doorway so essentially the same room but a different part of it) at about 9 months because he tried to turn in his hammock and he wasn't comfortable.
Had hell the first night, I stayed with him the whole night (eventually got in the cot with him for a sleep), neither of us slept very much. Called in back up for the following day so I could rest while he was entertained through A time and I came back on duty for nap time so I could ensure he was put down the 'right' way and reassure him that I was there for him no matter what.
About 2 more nights of some disturbance (I think I spent the second night sleeping on the floor by his cot), then sttn and no more further issues.