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  • Title: Nocturnal sleep and daytime alertness of aircrew after transmeridian flights.
    Author: Nicholson AN, Pascoe PA, Spencer MB, Stone BM, Green RL.
    Journal: Aviat Space Environ Med; 1986 Dec; 57(12 Pt 2):B43-52. PubMed ID: 3800829.
    Abstract:
    The nocturnal sleep and daytime alertness of aircrew were studied by electroencephalography and the multiple sleep latency test. After a transmeridian flight from London to San Francisco, sleep onset was faster and, although there was increased wakefulness during the second half of the night, sleep duration and efficiency over the whole night were not changed. The progressive decrease in sleep latencies observed normally in the multiple sleep latency test during the morning continued throughout the day after arrival. Of the 13 subjects, 12 took a nap of around 1-h duration in the afternoon preceding the return flight. These naps would have been encouraged by the drowsiness at this time and facilitated by the departure of the aircraft being scheduled during the early evening. An early evening departure had the further advantage that the circadian increase in vigilance expected during the early part of the day would occur during the latter part of the return flight.
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