Feeling Tired at 3pm? You Might Not Be Drinking Enough Water
There are few things more familiar than the afternoon slump.
You’re staring at your screen, your concentration starts to drift, another coffee suddenly seems like a brilliant idea, and the to-do list somehow feels twice as long as it did that morning. Most of us blame poor sleep, a busy schedule or even lunch – but one everyday habit is often overlooked.
Hydration.
While it’s easy to think of dehydration as something that only happens during heatwaves or after intense exercise, experts say even mild dehydration can quietly affect how we feel throughout a normal working day.
Why hydration matters more than many people realise
Whether you’re working from home, commuting into the office or spending your day on your feet, your body relies on a steady intake of fluids to function efficiently.
Unlike food, where we often notice hunger building, dehydration can creep in gradually without us immediately recognising what’s happening.
Could dehydration be causing your afternoon slump?
Many of the symptoms people associate with a busy day can also be linked to not drinking enough fluids.
These can include:
- Difficulty concentrating
- Feeling unusually tired
- Headaches
- Brain fog
- Reduced alertness
- Irritability
- Dry mouth
Research has shown that even relatively mild dehydration — around 1–2% of body weight lost through fluid — may influence attention, mood and cognitive performance.
While hydration certainly isn’t the answer to every dip in energy or productivity, it’s one of the simplest lifestyle factors to address.
How much water should you actually drink?
The NHS Eatwell Guide recommends that adults generally aim for six to eight cups or glasses of fluid each day. Water is an excellent choice, although tea, coffee and lower-fat milk also contribute towards your daily fluid intake.
Exactly how much you need will vary depending on factors including:
- Your body size
- Your activity levels
- Your working environment
- The temperature around you
- Whether you’re physically active throughout the day
Someone working outdoors or carrying out manual work is naturally likely to need more fluids than someone sitting in an air-conditioned office.
The important thing isn’t necessarily hitting an exact number every day, but drinking consistently rather than waiting until you’re already thirsty.
Small habits can make a big difference
One of the biggest mistakes people make is trying to “catch up” on hydration later in the day.
Instead, experts recommend building hydration into your existing routine.
Simple changes include:
- Keeping a water bottle visible on your desk rather than tucked away in a bag.
- Drinking a glass of water before your morning coffee.
- Refilling your bottle whenever you take a break.
- Having a drink before meetings or after returning from lunch.
- Choosing a reusable bottle that’s large enough to suit your daily routine.
These small prompts make it much easier to drink regularly without needing to think about it.
Don’t ignore the early warning signs
It’s easy to dismiss headaches or tiredness as simply part of modern life, but sometimes the explanation is much simpler.
If you regularly experience afternoon fatigue, poor concentration or brain fog, it could be worth asking yourself one simple question:
Have I actually had enough to drink today?
Hydration won’t solve every workplace wellbeing issue, but it’s one of the easiest healthy habits to improve — and one that costs very little.
Sometimes the simplest changes can make the biggest difference to how you feel.
This editorial was inspired by information and expert commentary originally provided by Yusuf Okhai, Managing Director of ION8. Original press material supplied by the ION8 press office and has been independently rewritten by Crave Magazine for editorial purposes.
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