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muscles are relaxed.  Looking around at my crewmates asleep, I felt like I was part of a grade-B science fiction movie.

[can't "turn over" -- no such thing as sleeping on your stomach, side, or back..]
One surprising difference is that when you twitch at night your arm flies away from your body--it's much more noticeable in orbit than on the ground.

All astronauts develop their favorite weightless games.  
[A]stronauts turn into 12-year-old kids--40-year old Colonels, scientists, and doctors are transformed...
Some carry toys (slinkies, gyroscopes, whirlies, yo-yo's) to see how they'll behave in weightlessness.
The yo-yo worked almost as well in orbit as on Earth. [E]xcept gravity doesn't hold the yo-yo a[t] the bottom of the string for "walk-the-dog"--and there is new meaning to the trick "around-the-world".  Some crews play with balls of liquid, creating the oscillating, floating blobs from the water gun, then poking them with straws and blowing them around the cabin.

Everyone takes a turn at somersaults, flips, and other gymnastic gyrations that are a lot easier when there's no danger of crashing to the floor.  That's the only way I'll ever be able to do a double back flip!

Some effects of weightlessness aren't evidenced until return to Earth.  The human body likes weightlessness.  It's easy.  Easy to move, easy to lift things, and everything is lighter