Why You’re Always Tired: The Hidden Causes Most Busy Mums Ignore

On the JJ Barnes Blog, if you’re a busy mum who’s always tired no matter how much sleep you get, I’m delving into the hidden causes most of us ignore — and the simple, practical steps that can actually help you feel energised again.

If you’re reading this while sipping your third coffee of the day, wondering how it’s only 11am and you already feel like you need a nap… you’re not alone. As a mum, feeling tired can feel like your default setting. But when “mum tired” turns into bone-deep exhaustion that no amount of sleep seems to fix, there’s usually more going on than just “busy life.”

Here are some of the most common hidden causes that many of us overlook — and what you can actually do about them.

Reasons You’re Always Tired

1. Poor Sleep Quality (Not Just Lack of Sleep)

You might be getting 7–8 hours, but if it’s broken, light sleep, you’re not getting the deep restorative stages your body needs. Night wakings, racing mind, or scrolling before bed all wreck sleep quality.

Quick wins:

• Create a strict wind-down routine (no screens 30–60 mins before bed)
• Try magnesium glycinate in the evening
• Keep your room cool and dark

2. Iron Deficiency or Anaemia

This is incredibly common in women, especially after pregnancy, heavy periods, or while breastfeeding. Even if your levels are “borderline,” you can still feel wiped out, dizzy, and short of breath.

What to do:

• Ask your GP for a full iron panel (ferritin is key — many doctors only check haemoglobin)
• Eat iron-rich foods with vitamin C (spinach + lemon, red meat, lentils)
• Consider a gentle supplement if needed (but get tested first)

3. Thyroid Issues (Especially Postpartum or Perimenopause)

Your thyroid regulates energy. After babies or as we head into our 30s/40s, it can go haywire. Hypothyroidism is a classic energy thief.

Signs to watch:

• Constant cold hands/feet, dry skin, hair loss, weight gain, brain fog

Action step: Request a full thyroid panel (TSH, Free T4, Free T3, and antibodies). Don’t settle for “normal” if you feel awful.

4. The Mental Load & Chronic Stress

The invisible work — remembering appointments, planning meals, worrying about everything — is exhausting. Chronic stress keeps cortisol high, which eventually leads to burnout and crushing fatigue.

Real talk: You cannot pour from an empty cup. Delegate. Say no. Protect your peace like it’s your full-time job.

5. Blood Sugar Rollercoasters

Skipping breakfast, surviving on toast and snacks, or too many carbs without protein/fat = energy crashes.

Fix it:

• Eat a protein-rich breakfast within an hour of waking
• Pair carbs with protein and fat (e.g., apple + peanut butter)
• Consider smaller, balanced meals more often

6. Nutrient Deficiencies (Vitamin D, B12, Magnesium)

Modern mum life + less time outdoors + depleted stores from pregnancy = deficiencies that sap energy.

Vitamin D deficiency is ridiculously common in the UK and directly linked to fatigue. Magnesium helps with sleep and stress. B vitamins are crucial for energy production.

7. Dehydration & Over-Reliance on Caffeine

Mild dehydration makes you feel foggy and tired. And that cycle of coffee → crash → more coffee is brutal on your adrenals.

Aim for:

• At least 2–3 litres of water daily
• Try swapping one coffee for herbal tea or a hydration drink with electrolytes

8. Hormonal Shifts (Postpartum, Perimenopause, or Cycle-Related)

Hormones massively affect energy. Oestrogen and progesterone fluctuations (especially in perimenopause) disrupt sleep, mood, and motivation.

If you’re in your late 30s+ and noticing new fatigue alongside irregular cycles, night sweats, or mood changes, it might be worth exploring.

When Should You See a Doctor?

Don’t brush it off if the tiredness is:

• New or getting worse
• Accompanied by other symptoms (weight changes, hair loss, palpitations, low mood)
• Affecting your daily life

Ask for proper bloodwork. You know your body best.

Gentle Ways to Start Feeling More Energised

• Movement — A 20-minute walk outside beats a workout when you’re exhausted
• Sunlight — First thing in the morning helps reset your body clock
• Boundaries — One “no” per day can be life-changing
• Joy breaks — 10 minutes doing something that lights you up (not just chores)
• Meal prep protein — Makes healthy eating easier on busy days

You’re not failing at life if you’re tired, mama. Your body is probably trying to tell you something important.

Start with one or two changes from this list. Small shifts can make a surprisingly big difference.