I have always questioned the 24 hour duty, most would end up
staying up past 24 hours. Get up for PT 0530, go to work then stay up for the
night until the next morning. Get relieved about 8:30, take care of a couple
things then head home, trying not to fall asleep, get to the house eat and it
is going on 11:00.
How many time were we reminded not to drive past so many hours at a safety briefing because of a long weekend, that we need to pull over and get some sleep.
I always let my folks sleep while I stayed up.
If a check needs to be made, the other person gets woke up, check is made, other person gets a nap. Driver is on call, but Risk assessment dictates he gets a cot and is only woke up if he needs to actually drive and the guy napping has an alarm in case his partner is a moron and falls asleep on him.