Shift work and fatigue

Working through the night or across rotating shifts asks a lot of your body's natural rhythms, and looking after yourself matters just as much as the work itself.

What it is

Shift work disrupts your body's internal clock, the natural rhythm that regulates sleep, alertness, digestion and mood across a 24-hour day. Night shifts, rotating shifts or early starts can leave this rhythm out of sync, leading to fatigue that ordinary tiredness does not fully explain. Over time, this can affect concentration, mood, safety and physical health.

Signs to notice

• Persistent tiredness that does not lift even after a full sleep
• Difficulty falling or staying asleep during the day after night shifts
• Irritability, low mood or reduced ability to concentrate
• Increased mistakes, near misses or safety incidents at work
• Relying heavily on caffeine or other substances to stay alert or to sleep

What helps

• Protect a consistent sleep window as much as your schedule allows, and treat it as non-negotiable
• Make your sleep space dark, cool and quiet, blackout curtains and earplugs help daytime sleep
• Limit caffeine in the hours before you plan to sleep, even if you feel you need it to function
• Eat regular, lighter meals during night shifts, heavy meals can worsen fatigue and disrupt sleep later
• Use bright light during your "wake" period and dim light as you wind down, to help reset your body clock
• Where possible, advocate for forward-rotating shift patterns, which tend to be easier on the body than backward-rotating ones
• Take fatigue seriously as a safety issue, not just a personal inconvenience, and speak up if you feel unsafe to work
• Plan demanding personal tasks and important decisions for your naturally more alert hours where you can
• Give yourself extra recovery time after a run of night shifts, your body needs more than a single day to reset

When to reach out for help

Reach out if fatigue is affecting your safety, mood, relationships or ability to function, or if you are relying on substances to manage sleep or alertness. Persistent exhaustion despite good sleep habits is worth discussing with a doctor.

Getting help in South Africa

Cleared Mind's EAP counsellors can help you manage the mental health impact of shift work and fatigue. Speak to your workplace health and safety representative about fatigue risk management where relevant.