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Loading contentOn the ISS the crew sees sixteen sunrises a day, and mission schedules can shift sleep times; the resulting disruption of the body clock degrades sleep, alertness, and performance.
How this effect is mitigated.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.