At some point, Bucky is subjected to severe sleep deprivation before they rape him. The rape is extra levels of horrifying because he's woozy, fading in and out, and can't track time or reality the way he should.

+ he hallucinates nightmarish things happening to him and can't be sure what's real and what isn't

+ he actually falls asleep mid-rape, after which is rapists are even crueler to him to keep him awake

bonus aftermath: Bucky Barnes, chronic insomniac, because sleep itself is a trigger