From the British news:
According to that document, Mr Mohamed was "intentionally subjected to continuous sleep deprivation" and subject to repeated threats. "His fears of being removed from United States custody and 'disappearing' were played upon," the summary noted.
He was also shackled during interviews, increasing the stress he suffered.
Torture just isn't what it used to be.... How lucky was he not to have his head chopped off on live TV!
But, then again, losing sleep can really make ya bitchy.