NASA Experiments fulfilled by the Russian cosmonaut in the frames of the annual medical program

Experiment Sleep Monitoring

Objectives:

The end of the "Sleep" experiment with the use of actigraph and registration of sleep with annual expedition members participation.

Tasks:

The test of hypothesis that
• long (annual) space flight leads to sleep disturbance identified by wrist actigraph;
• sleep duration is connected to impression of light at an inopportune time and/or insufficient intensity while transferring crew members to needed cycle of sleep and wakeful state;
• sleep disturbances and/or biorhythms failure lead to subjective dissatisfaction of sleep and vivacity level in the day-time;
• long (annual) space flight leads to the duration's reduction and quality loss of a sleep, and also leads to tiredness during the day according to the sleep and wakeful state log data.

Used science hardware:

• Actiwatch Spectrum wrist actigraph;
• sleep log.

Experiment results:

Data obtained by Actiwatch Spectrum actigraph.