Fatigue Basics – Rugged At Work

Fatigue: Stay Alert, Stay Safe

20 min

Welcome — Fatigue is a safety hazard, not a mindset problem

Fatigue turns normal work into high-risk work. It slows reaction time, reduces decision quality, and increases the chance of errors — especially in routine tasks.

This course gives you a practical system to identify fatigue early, use the Rugged Fatigue Risk Assessment tool, and apply controls so you get home safe.

Course introduction

Outcome
By the end, you’ll know exactly when to proceed, modify tasks, or stand down — and how to escalate early.

Step 1 — Understand what creates fatigue risk

Fatigue risk builds from a few predictable drivers. The biggest ones are:

Primary fatigue drivers

Not enough sleep (last 24–48 hours)
Long time awake (hours since waking)
High perceived sleepiness / low alertness (self-rating)
Long shifts, night shifts, early starts, overtime
Commute length and time of day
Heat, monotonous tasks, low stimulation environments

Reality
If your sleep is low or you’ve been awake too long, willpower won’t fix it. Controls must change the work.

Step 2 — Use the Fatigue Risk Assessment tool (2–3 minutes)

The tool uses a small set of inputs to estimate fatigue risk before or during a shift: sleep in last 24 hours, sleep in last 48 hours, hours awake, and a Samn‑Perelli fatigue rating.

Tool inputs

Total sleep in last 24 hours (HH:MM)
Total sleep in last 48 hours (HH:MM)
Hours since last woke
Samn‑Perelli fatigue rating (1–12)

Open the Fatigue Risk Assessment tool

Samn‑Perelli scale quick card (PDF)

How to complete the fatigue tool

Step 3 — Interpret your risk band (what it means)

The tool converts your inputs to a score and maps that score into a risk band. Bands range from VERY_LOW through to VERY_HIGH.

Risk bands (example set)

VERY_LOW
LOW
LOW_MEDIUM
MEDIUM
MEDIUM_HIGH
HIGH
VERY_HIGH

Escalation bands
Medium and above requires controls and supervisor involvement. High/Very High may require immediate duty modification or stand-down.

Fatigue controls by band (PDF)

Step 4 — Apply controls (what to do at each band)

Fatigue management is not a lecture — it’s a control plan. Use the actions below as a practical playbook.

VERY_LOW / LOW
Proceed as normal but monitor alertness. Hydrate and take micro-breaks.

MEDIUM
Avoid safety-critical tasks, increase breaks, rotate tasks, and increase supervision.

HIGH / VERY_HIGH
Stop safety-critical work immediately. Supervisor must modify duties or stand-down and consider safe transport and recovery.

Applying fatigue controls at work

Step 5 — Reduce fatigue risk before it becomes a problem

Most fatigue problems are predictable. The best workplaces treat recovery like a system: sleep opportunity, workload, breaks, and smart planning.

Personal actions (worker)

Protect sleep opportunity (consistent bedtime/wake time where possible)
Limit heavy meals and alcohol before sleep
Use caffeine strategically (not as a substitute for sleep)
Hydrate and fuel consistently
Plan your commute (avoid driving if you’re high risk)
Speak up early if you’re trending tired — before a mistake happens

Micro-break rule
Short, frequent breaks beat long breaks taken too late. Breaks are a control, not a reward.

Step 6 — Supervisor actions (fit-for-duty decisions)

Supervisors must treat fatigue like any other hazard: increase supervision, rotate tasks, modify duties, or stand-down when required.

Supervisor actions (when risk increases)

Confirm fit-for-duty and task suitability
Increase supervision and task rotation
Increase break frequency and reduce exposure to monotonous tasks
Modify duties / remove safety-critical tasks
Arrange safe transport if required
Document contributing factors and controls applied

Supervisor fit-for-duty workflow

Step 7 — Report early + learn from events

Fatigue-related incidents often show up as near misses, lapses in attention, or repeated small errors. Reporting early protects everyone and helps improve rosters, workloads, and job design.

Report when you notice

Near misses or close calls
Microsleeps or heavy eyelids
Slower reaction time or poor concentration
Repeated mistakes or forgotten steps
Driving risk concerns after shift

(Optional) Company fatigue reporting / incident link

Non-negotiable
If you are HIGH or VERY_HIGH risk, do not drive or perform safety-critical tasks. Escalate immediately.

Declaration + Quick Reference

Fatigue quick reference (PDF)

Declaration: I confirm I understand workplace fatigue risks, how to use the fatigue assessment tool, and the controls required to manage fatigue safely.

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