Due to the work nature of airline pilots, who often cross several timezones and regions of sunlight and darkness in one day, and spend many hours awake both day and night, they are often unable to maintain sleep patterns that correspond to the natural human circadian rhythm; this situation can easily lead to fatigue. The NTSB cites this as contributing to many accidents[unreliable medical source?]  and has conducted several research studies in order to find methods of combating fatigue in pilots.
Whose work habits and environment prevents them from maintaining a regular sleep pattern?
airline pilots
På grund av att piloter, som ofta korsar flera tidszoner och regioner av solljus och mörker på en dag och tillbringar många timmar vakna både dag och natt, är de ofta oförmögna att upprätthålla sömnmönster som motsvarar den naturliga mänskliga dygnsrytmen; denna situation kan lätt leda till trötthet. NTSB anför detta som bidragande till många olyckor[otillförlitlig medicinsk källa?] och har genomfört flera forskningsstudier för att hitta metoder för att bekämpa trötthet hos piloter. Vems arbetsvanor och miljö hindrar dem från att hålla ett regelbundet sömnmönster?
Because pilots, who often cross several time zones and regions of sunlight and darkness in one day and spend many hours awake both day and night, are often unable to maintain sleep patterns that correspond to the natural human circadian rhythm; this situation can easily lead to fatigue. NTSB cites this as contributing to many accidents[unreliable medical source?] and has conducted several research studies to find methods to combat fatigue in pilots. Whose work habits and environment prevent them from keeping a regular sleep pattern?
Flygpiloter
Air pilots