The ex-wife of disgraced former Cabinet minister Chris Huhne said she slept "incredibly well" on her first night in Holloway women's prison in north London as she had been exhausted.
Ms Pryce was speaking to launch her new book, Prisonomics, the royalties from which are going to the charity Working Chance, which finds work for offenders reaching the end of their sentences and ex-offenders.
She told BBC Breakfast: "By the time I got to Holloway I was absolutely exhausted.
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"They do say that when you go to jail you get locked in finally on your first night and you go to bed and you turn to the wall and you cry, basically spend the night crying," she said.
"In my case, probably because I was so tired, I slept incredibly well, I have to admit, and it carried on being the case because it must have been a pretty emotionally tiring period for me and somehow through the jail period I managed to pull through."
Pryce and Huhne were jailed for eight months after she took speeding points for him, and the Lib Dem ex-minister claimed the media stories which led to his prison term were ''payback'' for his support for investigations into allegations of hacking by Rupert Murdoch's newspapers.
But Ms Pryce said: "I have no comment to make on what he thinks. I don't begrudge anyone in terms of what's happened, or any of the journalists, frankly."
She told BBC Radio 4's Today programme: "I did something and I paid the price for it and that is it."