>How true is this though ?
Which part?
Honestly, I don't know how effective monitoring affect is per se but as a wild guess I'd say it's at least as accurate as a polygraph/coin flip.
However, I think there is more weight in the idea that a story that is repeated verbatim like that is more likely to be fabricated or at least neglecting some of the truth (which is the takeaway I got from the article).
Sleep deprivation appears to be a pretty popular "enhanced interrogation technique": https://en.wikipedia.org/wiki/Sleep_deprivation#Interrogatio...
But just like every other form of torture its efficacy is highly questionable (e.g. the inherent possibility of false confessions). I think sleep deprivation is particularly problematic because while it does seem to almost universally deplete the victim's willpower/resistance, it also causes a profound detriment to memory and other cognitive function-- meaning it is completely useless in cases where the victim isn't talking because they don't remember the information rather than because they just don't want to cooperate.
See "Educing Information, Interrogation: Science and Art, Foundations for the Future": https://fas.org/irp/dni/educing.pdf