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Do astronauts use their toes to grip with in zero gravity?

Crew members generally wear socks all the time while working aboard the ISS. I don't think I ever saw a single barefoot astronaut float past the six pack video downlinks in the 3 years I was an ISS ...
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Do ISS crew have the opportunity to take daily naps if they'd like to?

No, ISS crew members do not really have the flexibility to take a consistent mid-day nap. Pretty much every moment of their day is scheduled down to the 5 minute increment. Shown below is the OPTIMIS ...
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