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A hidden problem is surfacing regarding certain pilots' behavior.

More than three in four pilots reported having at least one "microsleep" while operating an aircraft in recent weeks, according to a report by aviation consultancy Baines Simmons based on responses from 7,200 pilots across 32 European countries.

The findings were published by the European Cockpit Association (ECA), which represents over 44,000 pilots across Europe, according to a press release.

HOW MUCH REST SHOULD FLIGHT ATTENDANTS GET? NEW PROPOSAL IGNITES FIGHT IN THE SKIES

The concerns extend beyond brief episodes of sleep in the cockpit.…