1. Flynn-Evans, E., Gregory, K., Arsintescu, L. & Whitmire, A. Risk of performance decrements and adverse health outcomes resulting from sleep loss, circadian desynchronization, and Work Overload (Natl. Aeronaut. Space Admin, Houston, 2016).
2. Barger, L. K. et al. Prevalence of sleep deficiency and use of hypnotic drugs in astronauts before, during, and after spaceflight: an observational study. Lancet Neurol. 13, 904–912. https://doi.org/10.1016/S1474-4422(14)70122-X (2014).
3. Dijk, D. J. et al. Sleep, performance, circadian rhythms, and light-dark cycles during two space shuttle flights. Am. J. Physiol. Reg. I 281, R1647–R1664 (2001).
4. Frost, J. D. Jr., Shumate, W. H., Salamy, J. G. & Booher, C. R. Sleep monitoring: the second manned Skylab mission. Aviat. Space Environ. Med. 47, 372–382 (1976).
5. Gundel, A., Polyakov, V. V. & Zulley, J. The alteration of human sleep and circadian rhythms during spaceflight. J. Sleep Res. 6, 1–8 (1997).