The fast of Ramadan begins at sunrise and ends at sunset. So force-feeding them at night is the religiously observant thing to do.
(To say nothing about force-feeding in general)
You have to admit, it's hilarious. Even the Soviets could not have made up this stuff.
And the US knows that this is illegal, too: http://www.guardian.co.uk/commentisfree/2013/jun/05/forcefee...
Eating during Ramadan is not a sin. You fast to sacrifice and share together (really, in spite of what you heard people get fat during Ramadan). But young children, the elderly, and the sick aren't required to fast nor is it considered a sin not to.
The doctors could have force fed them swine blood at high noon and it would not make an iota of difference. To the detainees it's a bullshit maneuver that says, "see, we're respecting Islam, we aren't burning the Koran anymore," when everyone can clearly see this is utter bullshit.