Here is a link from the NTSB which describes the events leading up to the head-on collision on the UP mainline in Goodwell, OK last year, which killed several crewmembers. [video=youtube_share;mKgDUJpr_l4]http://youtu.be/mKgDUJpr_l4[/video]
So the eastbound crew had to have been asleep? (or otherwise unconscious?) They didn't respond to visible cues, entering emergency 12 seconds after the westbound and only 8 seconds before impact....probably because the horn woke them? Hour and 15 minutes into their trip doesn't seem like they would have been fatigued assuming proper rest from their last leg, but maybe they'd been rolling for a week straight or something. Have they released any of those details yet? Just seems very odd...
There is one, but in all honestly, it's like slapping the snooze on an alarm clock. If you're really tired, you'll hit and and not remember.