I captured an incapped raider and told my doctor to heal him, but when half of his wounds where healed, he got his consciousness back and left the bed (while still bleeding). Now I can't make him go to bed again, I even changed his bed to a medical one but he refuses to use it. Force wardening also does nothing. Also note that I use sleeping spots in my prison and the doctor weren't using medicine. Maybe this is related.
Same thing just happened to me, [M|0.7.584]. Can't get the prisoner back to bed, so he just wanders around the prison room as he bleeds out. :(
A workaround is to set an operation (harvest kidney etc.) and cancelling it once the prisoner has been anesthetized. This leaves prisoner stunned in his/her bed, allowing you to properly heal him/her.
Colonists will stand up and get out of healing bed the first time they're hungry. You can send them back no problem.