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Water.Day_Women in Bed waking up
You literally lose a bottle of water sleeping

Your body loses about 0.47 liters of water just through overnight breathing - that's why you wake up naturally thirsty.

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Water.Day_woman hand on forehead
2% water loss = major brain fog

Losing just 2% of your body's water content can impair concentration, increase anxiety, and make tasks feel significantly harder.