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The Mistake: You get up at the same time every day, but you throw caution to the wind during the weekend.

Why That's a Problem: Yes, we're talking about sleep hygiene, and we know you've heard it a million (and one) times, but there's new reason to get on board. Just one night of sleep loss can throw off the circadian rhythms of genes that help keep your metabolism moving at a quick pace, according to a recent small study in the Journal of Clinical Endocrinology and Metabolism.

The Fix: Make bedtime the same across the board, or at least try to get close to that goal.