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Actigraphy: A Tool for Monitoring Sleep and Activity in an Isolated Environment (Aquarius) (NEEMO-ACTIWATCH)
Principal Investigator
Research Area:
Species Studied
Scientific Name: Homo sapiens Species: Human

Sleep quality may be disturbed in crowded, isolated environments such as the International Space Station (ISS) and the Aquarius habitat. Potential disturbances in the sleep/wake cycles of astronauts and aquanauts compared to ground-based sleep/wake cycles need to be defined in order to understand its consequences on human performance and well-being. The purpose of this study is to quantitate objective measures of sleep quality such as sleep duration, sleep latency and sleep efficiency with a non-intrusive wrist-worn sleep/wake activity monitor known as the Actiwatch®. Crewmembers wore the Actiwatch® on the non-dominant hand at all times while inside the habitat. A record of activities and sleep was kept, including in-suit Doppler use. The collection of actigraphy data with an Actiwatch® allowed an objective measure of crewmember activity and sleep quality. Altered activity and sleep quality data were correlated with data obtained in the in-suit Doppler and STARx/ARES studies.

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Circadian rhythm

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Data Information
Data Availability
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Illumination level
Sleep duration
Sleep efficiency
Sleep latency

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
NEEMO 5 06/16/2003 06/29/2003 14 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
National Aeronautics and Space Administration (NASA)
Hardware Items