NASA conducts research while orbiting more than 200 miles above the Earth to learn how humans and materials behave outside of a gravity-influenced world.
Research Objective: Sleep-Long examines the effects of space flight and ambient light exposure on crewmembers’ sleep-wake cycles during long-duration stays on the International Space Station (ISS).
Research Summary: During this investigation, crewmembers will wear an Actiwatch to record activity and ambient light levels. They will also document the amount and quality of sleep they are getting in a sleep log. This data will then be used to develop sleep disruption countermeasures for long-duration space flights.
Timeframe: Sleep-Long began in 2007 on Expedition 14 and will continue through Expedition 26 in 2011.Earth Application: A better understanding of sleep-wake cycles can lead to improvements in diagnosing and treating insomnia. This work could benefit the health, productivity and safety of groups with a high prevalence of insomnia, such as shift workers and the elderly.
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