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It's much easier for me to sleep in space than it is back home. We sleep in a cabin, and you can float inside.

Astronauts are not superhuman. They lead ordinary lives and have varied personalities.

So most astronauts are astronauts for a couple of years before they are assigned to a flight.

My father said there were two kinds of people in the world: givers and takers. The takers may eat better, but the givers sleep better.

I am a traveler. I am a nomad. I rarely sleep in the same bed more than three or four nights. And I know hotel life better than anyone.

There are no wishy-washy astronauts. You don't get up there by being uncaring and blase. And whatever gave you the sense of tenacity and purpose to get that far in life is absolutely reaffirmed and deepened by the experience itself.

Sleep is for squares.

If you think about evolution, sleep, at some time, was a dangerous undertaking. You lie down in your cave or shelter, and along comes a predator and has you for dinner. Many creatures do not sleep or sleep while standing so they can escape from dangerous situations.

From day one, I have been told I am no different from the male astronauts. As a pilot, I flew in the sky. Now that I am an astronaut, I will fly in space.