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Sleep Well But Still Tired? Causes and How to Recover Your Energy

01/08/2026 04:34 - Salud

Sleep 8 Hours and Still Tired? You Need to Read This

Waking up feeling exhausted is more common than you think, but the good news is that small changes can make a big difference.


Fatigue doesn't always come from poor sleep habits. According to specialists who spoke to Infobae, persistent tiredness can have physical and psychological origins. Dr. Estefanía Belén Mondin, a psychiatrist at Hospital Italiano de Buenos Aires, explained that stress, anxiety, and emotional concerns can drain your energy.

The 10 Hidden Causes That Steal Your Energy

1. Stale Air in the Bedroom

Dr. Jemma King warned in The Guardian that carbon dioxide levels can exceed 1,000 ppm, reducing deep sleep. Opening the window just 2 cm helps significantly.

2. Lack of Natural Light

Dr. Brendan Gabriel (University of Aberdeen) notes that daylight helps distinguish day from night, improving blood sugar control.

3. Lighter Sleep with Age

Dr. Stella Maris Valiensi (Hospital Italiano) indicates that as we age, we experience more nighttime awakenings and have more trouble falling back asleep.

4. Late Dinners

Proteins take 4 to 6 hours to digest, raising body temperature and hindering the cooling needed for sleep.

5. Presbysomnia (Age-Related Sleep Changes)

Just like presbyopia, the biological clock shifts forward with age, reducing sleep quality.

6. Sedentary Lifestyle

Sitting for long hours signals the brain to conserve energy. Getting up every 30 minutes for just 2 minutes changes everything.

7. Mattress and Dust Mites

Dust mite droppings cause congestion and micro-awakenings. Washing bedding weekly and airing the mattress is key.

8. Lack of Fiber

Dr. Emily Leeming (King's College) recommends at least 30 g daily for stable blood sugar release and lasting energy.

9. Nighttime Anxiety

Studies from 2022 and 2024 show that anxious thoughts worsen at night, a phenomenon known as 'mind after midnight'.

10. Mental Rumination

Repeatedly focusing on worries drains mental resources. Mindfulness and therapy are excellent allies.

The Afternoon Slump and How to Avoid It

According to a report based on research by Dr. Mark Hyman and published by El Imparcial, the tiredness that hits between 2 and 4 PM is often due to blood sugar instability, disrupted circadian rhythms, and sustained stress. Avoiding coffee on an empty stomach and eating protein and fiber at breakfast can make a huge difference.

Soft Life Habits to Recover Your Energy

Experts from the American Psychological Association (APA) and the NHS recommend adopting a 'soft life' approach based on sustainable practices:

  • Regular schedules: Going to bed and waking up at the same time stabilizes your biological clock.
  • Digital detox: Turn off screens one hour before bed to boost melatonin.
  • 90-minute work blocks: Work for 90 minutes, then rest 15-20 minutes while exposing yourself to natural light.
  • Hydration and nutrition: Drink water consistently and avoid ultra-processed foods to prevent energy crashes.

When to see a doctor: If fatigue persists for more than 4 weeks despite improving your habits, it's advisable to get blood tests for complete blood count, ferritin, thyroid function, and vitamin B12. Sleep apnea and depression are also common and treatable causes. Taking care of your health is always a good idea!

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Alfredo's Column Alfredo S. Quiroga

Alfredo S. Quiroga