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When a person is very tired, it is possible to reset the alerter when being half asleep, and for the two minutes or so of alerter silence, a person can be fully asleep.  If they made alerters so a reset required the engineer to do 20 pushups, then it might do a better job of keeping a person awake.  But you cannot add too much burden to resetting the alerter because it has to be reset so often in order to be effective.  I have a link somewhere to a collision caused by an engineer sleeping on the alerter.  I will see if I can find it.
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