On earth, gravity determines up and down. Gravity pulls everything down. Light objects carried up by the wind. NASA Astronauts used to have a hanging doll in their cockpit. Once they leave the earth's gravitational field, the hanging doll starts to lift up and float. The sense of 'up and down' goes off. Every loose object starts to fly and float.
On earth, sleeping means lying down on a bed. In space station at zero gravity, one can sleep at any position. He has to strap himself with the wall, else he will float and wake up at the other end of the space station. Pouring water works easily on earth due to gravity. But pouring down is impossible in the space. In the vast empty cosmic space, directions, back and front, up and down - all goes meaning less.
Consider a fly, flying inside a room, in curvy-turvy, zig-zag path. For the fly, above the head is top; its face points the front, its legs indicates down. Hence, in fly's point of view, its orientation changes continuously. But for us, the room remains as a frame of reference and we can pinpoint fly's location at any time exactly.
The changing orientation or x,y,z axes for the fly can be calculated using mathematical equations. The equations are formulated using curvature and twist of the path.
Air planes are also fly like house fly.(some times). Plane's orientation in the eye of pilot can be calculated in the above way.
Hence 'up and down' for a fly or a flight is changing one.
When you go up and up, there is no up and down.
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