Nine Hours Awake Before a Night Shift
It is 4:00 pm. You finished your last shift at 7:00 am after driving from 8:00 pm to 7:00 am (11 hours on duty, 10 hours driving within your allowed work time). You slept from 8:00 am to 1:00 pm - five hours. You are rostered to start again at 10:00 pm tonight for another long night run. You feel 'okay, a bit flat'. You have a 30-minute break available mid-shift. Your employer says the roster is legal and others do the same rotation.
1. Assess the rest you have had against what a night shift demands. What is the risk?
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You finished at 7:00 am and are due to start at 10:00 pm - that is a 15-hour break window, but you only slept 5 hours (8:00 am–1:00 pm) within it. You have then been awake from 1:00 pm to a 10:00 pm start - 9 hours awake before the shift even begins, on top of an 11-hour night shift just completed.
Risk factors stack up:
- Short sleep (5 h) against a long night shift;
- Long prior wakefulness - by, say, 4:00 am into the new shift you would have been awake ~15 hours plus the prior shift's fatigue debt;
- Circadian low in the early hours, when night-shift fatigue peaks;
- Cumulative fatigue from consecutive night work.
'Feeling a bit flat' after 5 hours' sleep is a warning sign, not a baseline. The legal roster being satisfied does not mean you are fit for duty - fitness for duty is a separate judgement from work/rest compliance.
2. What should you do before accepting the 10:00 pm start, and what would make you decline it?
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Before starting:
- Try to get more sleep in the afternoon/evening (a nap before 10:00 pm materially reduces risk).
- Tell your employer honestly that you had only 5 hours' sleep after an 11-hour night shift and that you are not confident of being fit for another full night run.
- Plan the mid-shift 30-minute break and use it as a real rest (stop, get out, nap if possible), not admin time.
Decline or seek a change if:
- You cannot obtain further rest and still feel impaired at start time;
- You experience micro-sleeps, drifting, heavy eyelids, or poor concentration on the drive in;
- The roster offers no realistic recovery before the next shift.
A 30-minute break does not offset a 5-hour sleep before a night shift. If you are not fit, say so before the wheels turn - the obligation is on you to not drive fatigued, and on the operator to have a system that lets you raise it without penalty.