Energy.
Fatigue that lasts almost always has a cause you can find: nights that are too short, irregular hours, badly timed meals, a lack of iron, too much training load. These articles help you trace it, from the 2 p.m. slump to tiredness that settles in, and get back to steady energy. If the fatigue persists anyway, see your doctor for a check-up.
Tired after eating: why it happens, and how to avoid it
The early-afternoon slump is circadian first (it happens even without lunch), and a heavy, sugary meal makes it worse. How to actually avoid it.
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Ideal nap length: how long should you nap?
10 to 20 minutes before 3 p.m.: the nap formula that recharges you without the grogginess. Why 30 minutes backfires, and when napping is a warning sign.
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Why am I always tired? The real causes of constant fatigue
Hidden sleep debt, irregular hours, undereating, overreaching, deficiencies: the most common causes of fatigue that won't go away, in the order to check them.
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