Sleep-Wake Cycles
Insufficient Sleep and Sleep Deprivation
Understanding Sleep
Stages of Sleep
Management of Insomnia
Substance Use Disorders Affecting Sleep
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Updated: Oct 2, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
Sigga Svala Jonasdottir1, James Bagrow2, Sune Lehmann3,4
1Tecnical University of Denmark, Kongens Lyngby, Denmark.
Travel impacts sleep by balancing duration: underslept individuals sleep more, while those sleeping over 7.5 hours sleep less. This study used wearable device data to analyze sleep changes during travel.
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