We have all been there or known someone who has. You push through a relentless month at work, surviving on four hours of sleep, double shots of espresso, and pure adrenaline. The second you finally cross the finish line or take a weekend off, your body completely collapses under a sudden fever, heavy flu, or stubborn infection
Most people write it off as bad luck or a “change of weather.” However a psychiatrist and senior registrar at the Federal Neuropsychiatric Hospital, Yaba, Lagos, falling ill after heavy stress is no coincidence. It is the direct biological consequence of a battered immune system
Speaking on the health programme Health Matters, Dr Babarinsa broke down the hidden medical link between long-term stress, sleep deprivation, and physical illness—exposing why pushing your body to the limit leaves your internal defences wide open
The 30% Drop: What Happens When Sleep Is Cut Short
In fast-paced cities from Lagos to London, surviving on minimal sleep is often treated as a badge of honour. People talk proudly about working 72-hour stretches and running on fumes. Yet, biologically, your immune system pays a massive toll for every hour of rest you skip
“Some studies have reported that when you don’t sleep continuously for up to 5 hours every day, you weaken the natural defence system of the body by 30%,” Dr Babarinsa revealed during the interview
That 30% drop is the difference between brushing off an airborne bug and spending a week knocked out in bed
“And you must understand that stress has its own impact on physical wellness,” Dr Babarinsa added, “because stress reduces the body’s immunity against illnesses.”
The Science: How Corticosteroids Disarm Your Internal Army
To understand why chronic stress makes you ill, you have to look at what happens inside your bloodstream when pressure stays high for too long
When you encounter daily strain, whether navigating gridlock traffic, meeting tight work deadlines, or managing family demands, your body releases stress hormones
“When someone is frequently exposed to stress, what is released is what we call the stress hormone, corticosteroids,” Dr Babarinsa explained
In short bursts, corticosteroids help you react to immediate danger. However, when stress becomes your “new normal”, these hormones flood your system continuously—with disastrous biological side effects
“What corticosteroids do in the long run is that they weaken the natural killer cells, which is the body’s immune system, the defence system, the first line of defence,” Dr Babarinsa emphasised
Your “natural killer cells” are your body’s front-line soldiers. They patrol your bloodstream to target and destroy invading viruses, bacteria, and mutated cells before they can turn into full-blown illnesses. When stress hormones systematically disarm those cells, your defences collapse
“And it predisposes the person to come down with ordinarily conditions, medical conditions or illnesses that they won’t—be it a flu, or a fever, or a cold,” Dr Babarinsa noted. “So stress has a lot of sequelae on physical, social, and even mental well-being.”
“I’ve Been Stressed, That’s Why”: Why We Need to Stop Normalising Illness
How many times have you heard a colleague or friend cough through a workday and casually say, “I’ve just been stressed lately, that’s why”?
Dr Babarinsa points out that whilst people intuitively recognise this connection, they rarely treat chronic stress as the serious medical risk factor it actually is
“That’s why you will have had friends or family or colleagues who come down with an illness and casually say, ‘I’ve been stressed, that’s why,’” Dr Babarinsa said. “Because there’s a lot of relationship between stress and physical illnesses. There’s a lot of relationship between stress and the onset of even long-standing medical conditions.”
When chronic stress disarms your immune system day after day, it does not merely leave you vulnerable to minor colds—it creates the biological conditions for long-term health complications to take root
Rebuilding Your Immune Shield
Protecting your immune system is not about buying expensive supplements; it is about fixing your basic biological routine:
- Protect Your 5-Hour Floor: Never let your sleep drop below 5 continuous hours. Aim for 6 to 8 hours of uninterrupted rest so your natural killer cells can replenish.
- Stop Glorifying Overwork: Sacrificing sleep for “hustle” directly degrades your immune capacity.
- Practice Active Stress Relief: Incorporate quick physical and mental breaks—such as deep breathing or taking a short walk—to lower circulating corticosteroid levels throughout the day.
Your immune system is only as strong as the rest you give it. Chronic stress is not just a mental burden—it is a physical strain that disarms your body’s natural defence force from the inside out
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