My character moans, how do I make him stop?
Sir it would appear that you have encountered something called a "bug",which is no wonder since DayZ is early access game.
This one is known bug and it is even reported on the DayZ feedback site so it will be fixed sooner or later...It doesn't seem to have a high priority for now however.
For now reconnecting should fix this problem,sadly it isn't viable long term solution.
Here is the link to the ticket if you want to track the progress.