I have had, on many occasions, to wake up passengers on my bus. Whilst most have been roused fairly easily, sometimes with the help of other passengers, it is sometimes necessary to get assistance. However we will call on the police in the first instance, mainly as they will have the manpower to assist if the passenger becomes abusive or violent. Certainly any call to emergency services would not be made under a 999 and would only call for ambulance if there I had a genuine concern. Our company advises us to avoid any confrontation with passengers and call for assistance and would take action against anyone would physically removed any passenger, but otherwise seems to have a more common sense approach than alot.