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You went to bed on time and slept through the entire night. So why did you wake up feeling like you were run over by a train? These five sneaky factors might be causing you to feel fatigued.

RELATED: How to Start and End a Busy Day So You Don’t Feel Totally Frazzled

cluttered desk
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Having a Cluttered Desk

Two words: mental exhaustion. According to psychology professor Sabine Kastner of Princeton University, the more objects you have in your visual field (read: a ton of stuff on your desk), the harder it is for your brain to filter them out and focus. The result? Your brain will end up tired.

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V8

Going Too Long Without Eating

Eating at consistent intervals every day (and not putting off lunch to meet a deadline or skipping afternoon snacks) sustains your energy levels and helps you get through the day feeling less tired. Drinking V8 Original is an easy first step to make that happen: It has one full serving of veggies, antioxidant vitamins A and C, and as much potassium as a small banana. The best part is it comes in 5.5-ounce cans that are easy to take with you anywhere. Pair it with a low-cal snack for the ultimate satisfying graze between meals.

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Twenty20

Skipping Your Morning Workout

Whether you’re a weight-lifting kind of gal or a yogi, skipping the gym because you think you need an extra hour of shut-eye can actually backfire. Research by the University of Georgia in Athens discovered that working out moderately hard for 20 minutes helps boost energy (compared with sitting quietly), while an earlier study found that sedentary individuals felt energized after completing a regular exercise program. That’s double proof.

buddha bowl recipe
Photo: Liz Andrew/Styling: Erin McDowell

Not Eating Enough Iron

Yikes, turns out an iron deficiency can make you feel sluggish, irritable, weak and unable to focus, according to the Mayo Clinic. Iron is vital to oxygen transportation to your muscles and cells. Boost your intake by chowing down on dark leafy greens, whole eggs, tofu, kidney beans, lean beef and nuts—and pair them with foods high in vitamin C, which improves iron absorption.

woman sleeping grey sheets
Twenty20

Sleeping Too Much

This might sound odd, but if you’re feeling sleep deprived, you might actually want to try sleeping less. According to Harvard Health, it’s quality of sleep—not necessarily quantity—that matters. Sleeping too many hours in a night can prolong the amount of time it takes you to fall asleep and compromise restfulness.

RELATED: Why Your Post-Workout Routine Is Just as Important as the Workout

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