‘I’m so not an astronaut!’ Samantha Harvey on her Booker-winning space novel – and the anxiety that drove it

She won the top prize with a time-distorted novel set on the International Space Station. Yet, the writer reveals, Orbital is actually a celebration of Earth's beauty with a pang of loss' - fuelled by her anxiety-induced insomnia

Samantha Harvey very nearly gave up on her novel Orbital, which last night won this year's Booker prize. Set on the International Space Station (ISS) 250 miles from Earth, Orbital follows the day-to-day lives of four astronauts and two cosmonauts as they hurtle through the universe at 17,500mph. She was a few thousand words in and suddenly lost her nerve. She felt she was trespassing in space. I am so spectacularly not an astronaut," she laughs, when we meet for coffee the morning after the Booker ceremony. I'm so unadventurous, so unaudacious, so impractical, cowardly, anxious. I would be terrible."

After a few months of dabbling with other ideas, she opened the abandoned word document on her computer by mistake. When she read it she found it had an integrity and pulse that drew her more than any of the other projects she was working on. I thought, I shouldn't be afraid of this. If I can do it in a way that's different to the way astronauts write about their time in space, then maybe there's something here." So she climbed back in and achieved lift-off.