September 3, 2026

Here’s what happens to your body when you drink water on an empty stomach.

You do not need to be severely dehydrated to benefit from a glass of water after waking.

## 2. It May Help You Feel More Alert

Even mild dehydration can sometimes contribute to:

* fatigue
* headache
* reduced concentration
* feeling sluggish

Drinking water after waking may help you feel more refreshed, especially if you went to bed slightly dehydrated or slept in a warm room.

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