The findings of an Ambulance Employees Association survey of worker morale are part of a campaign for minimum 10-hour breaks between shifts as part of an upcoming enterprise bargaining agreement.

However, Ambulance Victoria has questioned the survey and says the number of actual reports of fatigue is not substantial.

The online survey questioned 320 of Victoria’s 2016 ambulance workers, including 17 in Bendigo, and it found 65 per cent of those in Bendigo - almost twice the state average - had considered leaving the service.

The survey found that more than half of the officers had six hours’ sleep, or less, on a work night, and 82 per cent said fatigue had led to an error of judgement at some time.

The stress on health and personal life stemming from work-related fatigue was the main cause of complaints about long shifts.

All Bendigo respondents said the 10-hour break between shifts would make a difference.

AEA state secretary Steve McGhie said a campaign to recruit 258 ambulance officers across Victoria would be undermined if up to 700 were kept in a position that made them think about leaving.

"The 10-hour rest break is a key platform of our demands.

"There is such a high level of fatigue in the industry that the eight hours (break between shifts) employees are on is not enough.

"This is not only the physical fatigue from constantly responding to emergencies, but the emotional and psychological fatigue of incidents and adjusting to their own emotional response."

Mr McGhie said the survey showed that fatigue-related issues were the main reason for sick leave - posing a productivity issue for the ambulance service.

But Ambulance Victoria regional manger David Burns said only two formal reports on fatigue-related problems, including driving issues, had been made in the region in the past 12 months.

He said WorkSafe Victoria had investigated both reports in the interests of ensuring the management of the service was safe and sustainable.

Mr Burns said he could not comment on the 10-hour break, which was subject to the EBA, but the amount of sleep officers had on a break was an individual choice.

He said the survey represented only 20 per cent of the staff and had to be looked at against the background of the EBA negotiations later this month.

"The survey needs to be taken in context.

"I would welcome a chance to look at the data."