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Hospitals, factories, and call centres rely on people who are awake when everyone else is asleep. But the health risks of working nights are getting harder to ignore. The human body was designed for daytime activity and nighttime rest, and circadian rhythm disruption can insidiously put pressure on virtually every organ system by interrupting this cycle. The first step to protecting yourself is to understand what the health effects of working night shifts are.
Quick Facts
- Heart: Long-term night work is associated with an 8%-20% higher risk of coronary events, hypertension and stroke.
- Sleep: Night workers are roughly three times more likely to develop chronic sleep problems.
- Metabolism: Eating late at night and poor sleep raise risks of insulin resistance, obesity and Type 2 diabetes.
- Mind: People on permanent night rosters are more likely to experience anxiety, depression & burnout.
How Night Shifts Affect the Body
Your internal clock runs in a roughly 24-hour cycle and is mostly affected by light. When you work through the night and sleep in the morning, light cues and sleep timing don’t line up. Melatonin tends to be lower with irregular sleep patterns, and other hormones are affected as well. This explains why night shift and hormonal imbalance are so often linked; studies have shown.
Heart & Metabolic Issues
The cardiovascular system gets hammered. Night shift work has been associated with higher blood pressure, an increased risk of ischemic heart disease and irregular heart rhythms such as atrial fibrillation. Night work is similarly linked to metabolic health risks due to misaligned meal timing and poorer blood sugar control. There is an increasing risk of diabetes and night shift work with age, as well as steady weight gain.
Sleep Disorders, Fatigue
The most well-known sleep disorder in shift workers is shift work sleep disorder. It manifests as excessive daytime sleepiness, fragmented sleep and insomnia. Chronic fatigue in shift workers can become the status quo if not monitored. Fatigue in night shift workers can slow reaction time and judgment. Sleep deprivation’s long-term effects include weaker memory as well.
Immunity, Cancer and Mental Wellbeing
Disrupting melatonin can lower the body’s immune defences and make it more prone to infection. Some research has linked this pattern to an increased risk of some cancers, including breast cancer. The mental health effects of night shifts are just as serious, with more frequent reports of mood swings, anxiety and low mood. To summarise, sleep disruption and chronic disease are two sides of the same coin, and many health problems of night shift workers tend to creep up gradually before becoming evident.
What Employers Can Do
night work poses health risks not only to the individual night worker. Sensible rosters, rest breaks and workplace sleep health programs protect staff and productivity. Practical steps to improve employee health and workplace safety include restricting consecutive night shifts and providing at least 48 hours of recovery time thereafter.
Sleep Recovery Tips for Night Workers
- Block morning light. Wear sunglasses on the way home so that your brain begins to wind down.
- Protect your bedroom. Make sure it’s dark, quiet and cool and maintain a regular sleep routine, even on days off.
- Watch your food: Final Thoughts. Avoid heavy, sugary or processed food between midnight and 6 a.m.
Night work is sometimes unavoidable, but the health risks of working nights can be managed. By acting early on sleep, food and light exposure can limit the impact of chronic sleep deprivation.
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