When you think of shift work, the downsides that immediately come to mind are tiredness and the difficulties of having a regular social life - but a recent study has shown working unusual hours can also have a negative affect on our health.
Medics, police officers, fire fighters and other shift workers could be at increased risk of developing diabetes, experts have said.
Compared to normal office hours, working shifts carries a 9% higher risk of developing diabetes, the study found.
Previous research has linked shift work to weight gain and increased appetite - both of which are risk factors for diabetes, the authors said.
Researchers examined 12 studies involving more than 225,000 people, of whom almost 15,000 had diabetes.
While the overall risk of developing diabetes was 9% among shift workers, the authors found that men who worked shifts were 37% more likely to develop the condition.
And those who worked rotating shift patterns, in which they worked different parts of the 24 hour cycle on a regular basis, had a 42% higher risk than those who worked a fixed shift pattern, they said.
Previous studies have linked shift work to a variety of health problems including digestive problems, some cancers and heart issues but this is the first study which links diabetes to the occupations which require abnormal working hours.
"Shift work is associated with a significantly increased risk of diabetes mellitus (DM), especially in men and groups with rotating shifts," researchers said.
"Given the increasing prevalence of shift work worldwide and the heavy economic burden of DM, the results of our study provide practical and valuable clues for the prevention of DM and a study of its aetiology."
Commenting on the research, Professor Nick Wareham, director of the Medical Research Council Epidemiology Unit at the University of Cambridge, said: "This new meta-analysis provides a useful summary across previously published studies of the magnitude of the link between shift working and type 2 diabetes.
"It suggests that there may be a moderately sized link, which is slightly stronger in men.
"The study can't exclude the possibility that the results are explained by other risk factors for diabetes that are also linked to shift working.
"If it were shown that it is shift working itself that has a link to diabetes, then the key question would be to identify what interventions could be put in place to alleviate the risks in those who have to work shifts."
In the UK, around 2.9 million people have diabetes, with around 90% of cases being type 2.
There are also thought to be around 850,000 people with undiagnosed diabetes.Suggest a correction