Airline pilot walking through an airport.Taylor Rains/InsiderPilots say they're so exhausted they're struggling to stay awake while operating flights.Around 75% in a survey of European pilots said they'd taken a "microsleep" in recent weeks.Pilots said their airlines didn't manage fatigue risk well and it was difficult to file fatigue reports.Some European pilots are suffering from exhaustion and taking "microsleeps" while operating aircraft to cope, a new survey reveals.Around 75% of the respondents said that they had had at least one microsleep while operating an aircraft in the four weeks prior, according to a July survey conducted by Baines Simmons, an aviation safety consultancy, for the European Cockpit Association.