Interesting that when they finally checked the time, it was just five minutes after the alarm.
If you consider they were trying not to look at the time (and so probably spent a while deciding whether or not to finally "give in"), I'd take that as a strong piece of evidence that humans have an extremely accurate internal chronometer, and that we are just bad at consciously accessing it.
If you consider they were trying not to look at the time (and so probably spent a while deciding whether or not to finally "give in"), I'd take that as a strong piece of evidence that humans have an extremely accurate internal chronometer, and that we are just bad at consciously accessing it.