Some nights you stay up very late and need to get up early, so naturally you feel tired. But sometimes, the root of your fatigue isn't so obvious, and everything from a hidden health issue to your gym habits could be to blame.Here are 7 reasons you could be dragging--and how to regain more energy than you ever remember having.

1. You're dehydrated

Healthy men and women who failed to replace a mere 1.5% of their water weight experienced mood swings and low energy levels. The study authors…
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