New research has found that prison erodes the brain due to a lack of stimulation - I could have told you that. But what's more interesting is how Peter Sunde, the co-founder of the file-sharing website The Pirate Bay, describes his experience (quote below), as he spent time in prison for aiding and abetting copyright crimes.
What is most difficult to cope with is the boredom, Sunde says. The days in prison merge into a grey mass, indistinguishable from each other. Sunde has trouble sleeping at night. “You become brain-dead in here,” he says. “A guy who has been here a long time said it best: what I miss most are new memories.”