After seeing many images of astronauts on the ISS sleeping, with their arms floating,

Astronaut Luca Parmitano sleeps in his berth on board the ISS. Credits: ESA

and Chris Hadfield describing arms floating up and head titling forward How Do You Sleep In Space? | Video I wondered, do astronauts in free fall have to consciously keep their arms down and head back while they are awake, but not engaged in an activity?



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