A pilot for a Sweden-based airline fell asleep during a flight from Denmark to Sweden while his co-pilot was using the toilet.

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The Scandinavian Airlines System Group pilot wrote in his report he fell asleep during the Copenhagen to Stockholm flight because he was "extremely tired" from having only slept four hours the previous night, Swedish news agency Tidningarnas Telegrambyra reported Thursday.

The pilot said he fell asleep while his co-pilot was using the toilet and the co-pilot had to buzz the door several times before he woke up and was able to open the cockpit.

The flight last year was kept on course by the plane's autopilot.

An SAS manager said the airline is not planning any disciplinary action against the pilot.