Results from a new study suggest that complaints against U.S. police officers increase when they work consecutive night shifts, Medical Xpress reports.

The odds of citizen complaints increase even more when night shift officers are required to make daytime court appearances in-between night shifts when they would otherwise be resting up for their next shift.

Results from the study indicate that citizen complaints were most prevalent on night shifts. The researchers also found that going to court during the day between night shifts further increased the odds of citizen complaints. This supports the idea that sleep restriction and fatigue, which increase when night shift officers must attend court, contribute to the likelihood that they will receive complaints from the public.